二级Java程序题--01基础操作:源码大全（all）

目录

1.基本操作（源代码）：

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

1.10

1.11

1.12

1.13

1.14

1.15

1.16

1.17

1.18

1.19

1.20

1.21

1.22

1.23

1.24

1.25

1.26

1.27

1.28

1.29

1.30

1.31

1.32

1.33

1.34

1.35

1.36

1.37

1.38

1.39

1.40

1.41

1.42

1.43

1.44

1.45

1.46

1.47

1.48

1.49（star）

1.50

1.51

1.52（star）

1.53

1.54

1.基本操作（源代码）：

1.1

import javax.swing.JOptionPane; //导入JOptionPane类

public class Java_1 { public static void main( String args[] ) { //*********Found******** JOptionPane.showMessageDialog( null, "欢迎\n你\n参加\nJava\n考试!" ); System.exit( 0 ); // 结束程序 } } /* JOptionPane类的常用静态方法如下： showInputDialog() showConfirmDialog() showMessageDialog() showOptionDialog() */

1.2

//*********Found******** import java.applet.*; import java.awt.Graphics;

//*********Found******** public class Java_1 extends Applet { public void paint( Graphics g ) { //*********Found******** g.drawString( "欢迎你来参加Java 语言考试!", 25, 25 ); } }

1.3

import java.applet.*; import java.awt.Graphics;

//*********Found******** public class Java_1 extends Applet{ public void paint( Graphics g ) { //*********Found******** g.drawString( "欢迎你来参加Java 语言考试!", 25, 25 ); } }

1.4

//*********Found********** public class Java_1{ public static void main(String args[]) { byte b = 10; // 二进制表示00001010 //*********Found********** **byte c = 0X000f;** b = (byte)(b ^ c); //*********Found********** System.out.println("b的结果是：" +b); } }

1.5

public class Java_1{ //*********Found********** public static void main(String args[]){ String string="现在学习如何访问一个字符串"; System.out.println("字符串 \""+string+"\""); //*********Found********** System.out.println("字符串长度："+string.length()); //*********Found********** System.out.println("其中第7个字符是："+string.charAt(6)); char sub[] = new char[20]; System.out.print("从字节数组的第7到12获取字符是："); string.getChars(6,12,sub,0); System.out.println(sub); } }

1.6

public class Java_1{ //*********Found********** public static void main(String args[]){ String string="现在学习如何访问一个字符串"; System.out.println("字符串 \""+string+"\""); //*********Found********** System.out.println("字符串长度："+string.length()); //*********Found********** System.out.println("其中第7个字符是："+string.charAt(6)); char sub[] = new char[20]; System.out.print("从字节数组的第7到12获取字符是："); string.getChars(6,12,sub,0); System.out.println(sub); } }

1.7

import java.io.*; public class Java_1{ public static void main(String[] args) { int[] anArray; //声明一个整数型数组 //*********Found********** anArray = new int[10]; //创建一个整数数组对象s //*********Found********** for (int i = 0; i < anArray.length;i++) { //对数组中每个元素赋值并显示 anArray[i] = i; //*********Found********** System.out.print(i+ " "); } System.out.println(); } }

1.8

//*********Found********** import java.io.*;

public class Java_1{ //*********Found********** public static void main(String[] args) throws Exception{ InputStreamReader ir; BufferedReader in; ir=new InputStreamReader(System.in); in=new BufferedReader(ir); System.out.println("输入年份是:"); //*********Found********** String s=in.readLine(); //*********Found********** int year=Integer.parseInt(s); if(year%4==0&&year%100!=0||year%400==0){ System.out.println(""+year+"年是闰年."); } else{ System.out.println(""+year+"年不是闰年."); } } }

1.9

//*********Found********** import java.io.*;

public class Java_1 { public static void main(String[ ] args) throws IOException { InputStreamReader ir; BufferedReader in; int sum, x; String data; //*********Found********** sum = 0; ir = new InputStreamReader(System.in); in = new BufferedReader(ir); System.out.println("请输入5个整数："); //*********Found********** for (int i = 1; i<=5; i++) { data = in.readLine(); x = Integer.parseInt(data); //*********Found********** if (x%2==0) sum += x; } System.out.println("偶数之和为"+ sum ); } }

1.10

import java.io.*; public class Java_1 { public static void main(String[ ] args) throws IOException { InputStreamReader ir; BufferedReader in; int max, x; String data;

    max = 0;ir = new InputStreamReader(System.in);in = new BufferedReader(ir);System.out.println("请输入5个正整数：");//*********Found**********for (int i = 1; i <=5; i++) {data = in.readLine();//*********Found**********x = Integer.parseInt (data);if ( max < x )//*********Found**********max = x;}System.out.println("输入的最大值是 "+ max);
}

}

1.11

public class Java_1{ public static void main(String[] args){ //***Found**** int[] scores = {90,80,75,67,53}; int best = 0; char grade;

// 找出这组成绩中的最高分
//*********Found**********
for (int i=0;i<5; i++){//*********Found**********if (scores[i]>best)best = scores[i];
}//求各分数的等级并显示
for (int i=0; i<scores.length; i++){if (scores[i] >= best - 10)grade = 'A';//*********Found**********else if(scores[i] >= best - 20)grade = 'B';else if (scores[i] >= best - 30)grade = 'C';else if (scores[i] >= best - 40)grade = 'D';elsegrade = 'F';System.out.println("Student " + i + " score is " + scores[i] +" and grade is " + grade);
}

} }

1.12

//***Found**** public class Java_1{ public static void main(String[] args){ int []a = {1,2,3,4,5,6,7,8}; int []b = {0,1,2,3,4,5,6,7}; int []c = new int[8]; int s=0;

    //*********Found**********for(int i=0;i<a.length;i++)c[i]=a[i]+b[i];for(int j=c.length-1;j>=0;j--)//*********Found**********s=s+c[j];//*********Found**********System.out.println("s="+s);
}

}

1.13

class MethodOverloading {

void receive(int i) {System.out.println("Receive one int data");System.out.println("i=" + i);
}
​
//*********Found**********
void receive(int x, int y) {System.out.println("Receive two int data");System.out.println("x=" + x + "  y =" + y);
}
//*********Found**********
void receive(double d) {System.out.println("Receive one double data");System.out.println("d=" + d);
}
​
//*********Found**********
void receive(String s) {System.out.println("Receive a string");System.out.println("s="+s);
}

}

public class Java_1 {

public static void main(String args[]) {MethodOverloading mo = new MethodOverloading();mo.receive(1);mo.receive(2, 3);mo.receive(12.56);mo.receive("very interesting, is not it?");
}

}

1.14

public class Java_1 { public static void main(String[] args) { //**Found**** for (int i=1;i<=5;i++){ for(int k=1;k<=5-i;k++) //***Found**** System.out.print(" "); //***Found**** for(int j = 1;j<=2*i-1;j++) System.out.print(""); //***Found**** System.out.println(); } } }

1.15

public class Java_1 { public static void main(String[] args) { int a,x = 2008; //***Found**** System.out.print( x +"->" ); while( x != 0 ){ //***Found**** a = x%10; System.out.print(a); //***Found**** x = x/10; } } }

1.16

public class Java_1 {

public static void main(String args[]) {int a[][] = {{2, 3, 4}, {4, 6, 5}};int b[][] = {{1, 5, 2, 8}, {5, 9, 10, -3}, {2, 7, -5, -18}};int c[][] = new int[2][4];for (int i = 0; i < 2; i++) {for (int j = 0; j < 4; j++) {//*********Found********c[i][j] =0 ;//*********Found********for (int k = 0; k < 3; k++) //*********Found********c[i][j] += a[i][k]*b[k][j];System.out.print(c[i][j] + "  ");}System.out.println();}
}

}

1.17

public class Java_1{

public static void main(String[] args){
​//*********Found********int[] ages = {35,43,28,39,62,57,48,29,54,46}; int sum = 0, avg = 0; int tt = 0,fot = 0,fit = 0,st = 0; 
​for (int i=0; i<ages.length; i++){if (ages[i] <=40 )tt++;else if (ages[i] >40 && ages[i]<=50)fot++;else if (ages[i] >50 && ages[i]<=60)//*********Found********fit++;else st++;}//*********Found********for (int i = 0; i<ages.length; i++)//*********Found********sum += ages[i];avg = sum/ages.length;
​System.out.println("<=40: "+tt+"     41-50: " +fot+"     51-60: " + fit +"     >=61: " + st);
}

}

1.18

public class Java_1 { //***Found** public static void main(String args[]) { int arr = {{1, 2, 3, 4, 5}, {6, 7, 8, 9, 10}, {11, 12, 13, 14, 15}, {16, 17, 18, 19, 20}, {21, 22, 23, 24, 25}}; //***Found** int i, j, sum=0; for (i = 0; i < 5; i++) for (j = 0; j < 5; j++) //***Found** if (i+j==4) sum += arri; System.out.println(sum); } }

1.19

public class Java_1 {

public static void main(String[] args) {int []a = {5,9,2,8,7};int max = 0;int k = 0,t ;for(int i=0;i<5;i++){//*********Found********if (a[i]%2==0 && max < a[i]){max = a[i];//*********Found********k=i;}}t = a[0];a[0] = a[k];a[k] = t;//*********Found********for(int i=0;i<a.length;i++)System.out.print(a[i] + "  ");
}

}

1.20

public class Java_1 { public static void main(String[] args) { //***Found** int []f= new int[10]; f[0]=f[1]=1; //***Found** for (int i=2;i<10;i++) f[i]=f[i-1]+f[i-2]; //***Found** for (int i=0;i<f.length;i++) //***Found** System.out.print(f[i]+" "); } }

1.21

import javax.swing.JOptionPane;

public class Java_1 { public static void main( String args[] ){ //变量初始化 int passes = 0, //考生通过的数目 failures = 0, //考生不通过的数目 student = 1, //学生计数器 result; //一门考生结果 String input, //用户输入的值 output; //输出字符串 //处理10名学生,用计数器控制循环 while ( student <= 10 ) { input = JOptionPane.showInputDialog( "输入结果(1=通过,2=不通过)" ); //***Found**** result = Integer.parseInt( input ); if ( result == 1 ) passes = passes + 1; else failures = failures + 1; student = student + 1; } //结果处理 output = "通过: " + passes + "\n不通过: " + failures; if( passes > 8 ) output = output + "\n提高学费"; //***Found**** JOptionPane.showMessageDialog( null, output, "对考试结果的分析示例", JOptionPane.INFORMATION_MESSAGE ); //***Found**** System.exit( 0 ); } }

1.22

public class Java_1 extends TT { //***Found**** public static void main(String args[]) { Java_1 t = new Java_1("小龙"); } public Java_1(String s) { super(s); System.out.println("您好吗？"); } public Java_1() { this("我是文朋"); } }

class TT { public TT() { System.out.println("多高兴啊!"); } public TT(String s) { //***Found**** this(); System.out.println("我是"+s); } }

1.23

public class Java_1 { //***Found**** public static void main (String args[]) { new SimpleThread("第1").start(); new SimpleThread("第2").start(); } }

//***Found**** class SimpleThread extends Thread { public SimpleThread(String str) { super(str); } public void run() { for (int i = 0; i < 5; i++) { //***Found**** System.out.println(i + " " + getName()); try { sleep((int)(2 * 100)); } catch (InterruptedException e) { } } System.out.println("运行! " + getName()); } }

1.24

//*****Found********** import javax.swing.*;

public class Java_1 { //**Found**** public static void main(String[] args) { System.out.println(); System.out.println("这是一个指定球半径，求球体积的程序。"); String input=JOptionPane.showInputDialog("请输入球半径。"); //***Found**** double r=Double.parseDouble(input); System.out.println("当球的半径是" + r + "时，该球的体积是 " + (Math.PIrrr*4/3)); System.exit(0); } }

1.25

// 阅读下列代码： public class Java_1 { //***Found**** public static void main(String []args) { String s1=new String("你正在考试"); String s2=new String("你正在考试"); System.out.println(s1==s2); //***Found**** System.out.println(s1.equals(s2)); } }

1.26

public class Java_1 { //***Found**** public static void main(String []args) { char ch='d'; //***Found**** switch(ch) { case 'a': System.out.print("a");break; case 'b': System.out.print("b"); case 'c': System.out.print("c");break; //***Found**** default : System.out.print("abc"); } } }

1.27

public class Java_1 {

public static void main(String[] args) { long sum; //***Found**** sum =0; for(int i=1;i<8;i+=2){ long b=1; //***Found**** for(int j=1; j<=i; j++) //***Found**** b = b * j; System.out.println( i + "!= " + b); sum+=b; } System.out.println("sum=" + sum); } }

1.28

public class Java_1 { public static void main(String args[]) {

    int x,n;//*********Found********n =0;for( x = 100 ; x <= 200 ; x++)if  ( x % 9 == 0 ) {//*********Found********System.out.print("  " + x);n++;//*********Found********if ( n%5 ==0) System.out.println( );}
}

}

1.29

public class Java_1 { public static void main(String args[]) { int i,count;

 //*********Found********count =0;for( i=100 ; i <= 200 ; i++)//*********Found********if ( i%3==0 ) count++;//*********Found********System.out.println("Count = " + count);
}  

}

1.30

//Interest.java //计算复杂利息 import java.text.DecimalFormat; import javax.swing.JOptionPane; import javax.swing.JTextArea;

public class Java_1{ public static void main( String args[] ){ double amount, principal = 1000.0, rate = .05; DecimalFormat precisionTwo = new DecimalFormat( "0.00" ); //***Found**** JTextArea outputTextArea = new JTextArea( 11, 20 ); outputTextArea.append( "年\t存款总计\n" ); for ( int year = 1; year <= 10; year++ ) { amount = principal * Math.pow( 1.0 + rate, year ); outputTextArea.append( year + "\t" + //***Found**** precisionTwo.format( amount ) + "\n" ); } //***Found**** JOptionPane.showMessageDialog( null, outputTextArea, "复合利息", JOptionPane.INFORMATION_MESSAGE ); System.exit( 0 ); } }

1.31

import javax.swing.JOptionPane;

public class Java_1{ //***Found**** public static void main( String args[] ){ PackageData d = new PackageData(); String output; output = "实例化后:\n" + d.toString(); d.x = 77; //修改包访问的数据 //***Found**** d.s = "祝您成功!"; //修改包访问的数据 output += "\n修改数据后的访问结果:\n" + d.toString(); //***Found**** JOptionPane.showMessageDialog( null, output, "对包的访问示范", JOptionPane.INFORMATION_MESSAGE ); System.exit( 0 ); } }

class PackageData { int x; //访问包的实例变量 String s; //访问包的实例变量 //构造方法 public PackageData(){ x = 0; s = "Hello"; } public String toString(){ return "x: " + x + " s: " + s; } }

1.32

import javax.swing.*; import java.text.DecimalFormat;

public class Java_1{ //***Found**** public static void main( String args[] ){ SimpleTime t = new SimpleTime( 12, 30, 19 ); //***Found**** JOptionPane.showMessageDialog( null, t.buildString(), " "this" 引用示范", JOptionPane.INFORMATION_MESSAGE ); System.exit( 0 ); } }

class SimpleTime { private int hour, minute, second; public SimpleTime( int hour, int minute, int second ){ this.hour = hour; this.minute = minute; this.second = second; }

public String buildString(){ //***Found**** return "this.toString(): " + toString() + "\ntoString(): " + toString() + "\nthis (with implicit toString() call): " + this; }

public String toString(){ DecimalFormat twoDigits = new DecimalFormat( "00" ); return twoDigits.format( this.hour ) + ":" + twoDigits.format( this.minute ) + ":" + twoDigits.format( this.second ); } }

1.33

import java.io.*;

public class Java_1 { public static void main(String[] args) { char[] charArray = {'a','b','c','d','e','f','g','h','i'}; char c ; try{ //***Found**** DataOutputStream out = new DataOutputStream( new FileOutputStream("test.dat")); for(int i =0; i<charArray.length; i++){ out.writeChar(charArray[i]); } out.close(); DataInputStream in = new DataInputStream( //***Found**** new FileInputStream("test.dat")); while(in.available() != 0){ c=in.readChar(); System.out.print(c+" "); } System.out.println(); //***Found**** in.close(); }catch(IOException e){} } }

1.34

//用2至20的偶数去初始化数组 import javax.swing.*;

public class Java_1{ public static void main( String args[] ){ final int ARRAY_SIZE = 10; int n[]; //引用整形数组 String output = ""; //***Found*** n = new int[ ARRAY_SIZE ]; //分配数组 //给数组赋值 for ( int i = 0; i < n.length; i++ ) n[ i ] = 2 + 2 * i; output += "数组下标\t值\n"; for ( int i = 0; i < n.length; i++ ) output += i + "\t" + n[ i ] + "\n"; //***Found**** JTextArea outputArea = new JTextArea( 11, 10 ); outputArea.setText( output ); //***Found**** JOptionPane.showMessageDialog( null, outputArea, "用2至20的偶数去初始化数组", JOptionPane.INFORMATION_MESSAGE ); System.exit( 0 ); } }

1.35

public class Java_1{ void equalsMethod1(){ //***Found**** String s1= "how are you"; //***Found**** char[] s2={'h','o','w',' ','a','r','e',' ','y','o','u'};

  //*********Found**********System.out.println(s1==s2.toString());

} public static void main(String args[]){ Java_1 OperAndExp=new Java_1(); OperAndExp.equalsMethod1(); } }

1.36

import java.io.*;

public class Java_1 { public static void main(String args[]) { int a=15,b=25,c=5,m;

    if(a>b){//*********Found**********if(b>c)m=b;else//*********Found**********m=(a>c)? c:a;}else{if(a>c)//*********Found**********m =a;elsem=(b>c)? c:b;}//*********Found**********System.out.println("median = " + m);}

}

1.37

import javax.swing.*; public class Java_1{ public static void main( String args[] ){ //***Found**** StringBuffer buf = new StringBuffer( "Hello, how are you?" ); String output = "buf = " + buf.toString() + "\nlength = " + buf.length() + "\ncapacity = " + buf.capacity(); buf.ensureCapacity( 75 ); output += "\n\nNew capacity = " + buf.capacity(); buf.setLength( 10 ); //***Found**** output+= "\n\nNew length = " + buf.length() + "\nbuf = " + buf.toString(); JOptionPane.showMessageDialog( null, output, "字符串缓存长度和容量的实例", //***Found**** JOptionPane.INFORMATION_MESSAGE ); //***Found**** System.exit( 0 ); } }

1.38

public class Java_1 { //**Found**** public static void main(String args[]) { byte b = 8; //***Found**** long g = 567L; float f = 3.1415f; double d = 2.789; int ii = 207; //***Found**** long gg = g+ii; float ff = bf; double dd = ff/ii+d; //***Found**** System.out.print("ii= "+ii+" "); System.out.println("gg= "+gg); System.out.println("ff= "+ff); System.out.println("dd= "+dd); } }

1.39

import javax.swing.JOptionPane; public class Java_1{ public static void main( String args[] ){ int x, result; String xVal; //***Found**** xVal = JOptionPane.showInputDialog( "输入1个整数:" ); //***Found**** x = Integer.parseInt( xVal ); //***Found**** result = x*x; JOptionPane.showMessageDialog(null, "该数的平方是" + result ); System.exit( 0 ); } }

1.40

public class Java_1 {

public static void main(String[] args) {int i, k, n;//*********Found********n= 0;//*********Found********for (i = 0; i<10; i++) {                            k = i * 10 + 6;//*********Found********if ( k%3==0) {System.out.print(k + "  ");n++;}}System.out.println("\n" + "The number is " + n + ".");
}

}

1.41

public class Java_1{ public static void main(String[] args){ //****found******* int[] arrayOfInts = { 33, 88, 5, 458, 18, 107, 200, 8, 622, 127 }; int searchfor = 18;

  int i = 0;//**************found*****************boolean foundIt = false;
​for ( ; i<arrayOfInts.length; i++){//**************found*****************if (arrayOfInts[i] == searchfor ){foundIt = true;//**************found*****************           break;}}
​if (foundIt) {System.out.println("Found " + searchfor + " at index " + i);} else {System.out.println(searchfor + "not in the array");}

} }

1.42

import java.lang.; import java.util.; public class Java_1 { public static void main(String[] args){ int n; double e = 1.0; System.out.print("请输入n: "); //*********Found******* Scanner scan = new Scanner (System.in); String nstr = scan.next(); //*********Found******* n = Integer.parseInt(nstr); double t = 1.0; for(int i=1;i<=n;i++){ //*********Found******* t = t/i; e = e + t; } System.out.print("e 的近似值为： "+e); } }

1.43

public class Java_1 { public static void main(String[] args) { //**found** char[] arrayOfChars = { 'A', 'B', 'A','D', 'E','F','G' }; char searchfor = 'A';

    int i=0, j=0;//**********found**********while ( i < arrayOfChars.length) {if (arrayOfChars[i] == searchfor) {System.out.println("Found " + searchfor + " at index " + i);j++;}//**********found**********i++;}//**********found**********if (j>0) {System.out.println("The total amount of " + searchfor + " is " + j );} else {System.out.println(searchfor + " is not in the array");}
}

}

1.44

import java.util.; import java.io.; public class Java_1 { //**found** static long sum =0; public static void main(String[] args) { //**found** for (int counter=0 ; counter <= 10; counter++){ System.out.printf("%d! = %d\n", counter, factorial(counter)); sum=sum+factorial(counter); } System.out.println("sum="+sum); } //**found** public static long factorial(long number ) { if (number <= 1) return 1; else return number * factorial(number - 1); } }

1.45

import java.lang.; import java.util.;

public class Java_1 { public static void main(String [] args){ System.out.print("请输入n: "); //**Found** Scanner scan = new Scanner (System.in); String nstr = scan.next(); //**Found** int n = Integer.parseInt(nstr); int b = 6; long sum=0,item=b; for(int i=1;i<=n;i++){ sum += item; //**Found** item = item * 10 + b; } System.out.print(n + "项的和为 " + sum); } }

1.46

import java.io.; import java.util.; public class Java_1 { static int number=4; //**Found** static int[] t1 = new int[number]; public static void main(String[] args) { Java_1 work=new Java_1(); //**Found** work.sort(); } void sort(){ System.out.println("请输入4个数："); //**Found** Scanner in_t1 = new Scanner(System.in); for(int i=0;i<number;i++){ t1[i]=in_t1.nextInt(); } for (int i = 0; i < t1.length; i++) { int pos = i; for (int j = i + 1; j < t1.length; j++) { //**Found** if (t1[pos] > t1[j]) pos = j; } if (pos != i) { t1[i] = t1[i] + t1[pos]; t1[pos] = t1[i] - t1[pos]; t1[i] = t1[i] - t1[pos]; } }

    for (int  i = 0; i <= t1.length - 1; i++)System.out.print(t1[i] + "\t");
}

}

1.47

public class Java_1{ public static void main(String[] args){ //**Found** int[] grades = {62,53,84,77,65,85,91,94,61,78,86,88}; int sum=0, avg = 0; int stus=0; int a=0,b=0,c=0,d=0,e=0;

//**********Found**********  for (int i=0; i<grades.length; i++){if (grades[i] <60 )e++;else if (grades[i] >=60 && grades[i]<=69)d++;else if (grades[i] >=70 && grades[i]<=79)c++;else if (grades[i] >=80 && grades[i]<=89)  b++;else a++;//**********Found**********sum+= grades[i];}//**********Found**********stus =grades.length;
//**********Found**********avg = sum/stus;System.out.println(">=90: "+a+";   80-89: " +b+";   70-79: " + c +";   60-69: " + d+";   <60: "+e);System.out.println(stus+" students, and the average is : "+avg);                     
}

}

1.48

import java.util.*;

public class Java_1 { public static void main(String [] args) { int n;

    //***************************Found*********************    Scanner scan=new Scanner ( System.in);String nstr=scan.next(); scan.close();//***************************Found*********************    n= Integer.parseInt(nstr);int[][] mat=new int[n][n]; for( int i=0;i<n;i++)for( int j=0;j<n;j++)mat[i][j]=(int)(Math.random()*101);for( int i=0;i<n;i++) {for( int j=0;j<n;j++)System.out.print(mat[i][j]+"  ");//***************************Found********************* System.out.println();}int diagSum=0;for(int i=0;i<n;i++)//***************************Found********************* diagSum+=mat[i][i];System.out.print("主对角线值的和为： "+diagSum);
}

}

1.49（star）

public class Java_1 { public static void main(String[] args) { int i, j, k, t; int[] m = {10, 21, 123, 5, 94};

    for (i = 0; i < m.length - 1; i++) {//**********Found**********k = i;//**********Found**********for (j = i+1; j < m.length; j++) {//**********Found**********if ( m[k]%10 > m[j]%10 ) {k = j;}}if (k != i) {t = m[i];//**********Found**********m[i]=m[k];m[k] = t;}}//**********Found**********for (i = 0; i < m.length; i++) {System.out.print("  " + m[i]);}System.out.println();
}

}

1.50

public class Java_1 {

public static void main(String[] args) {int i, j, a, b;int[][] m = {{1, 2, 3}, {1, 2, 3, 4}, {1, 2, 4, 300, 5}, {3, 5, 6, 8, 10, 9}};
​a = 0;//**********Found**********b = 0;//**********Found**********for (i = 0; i < 4; i++) {//**********Found**********for (j = 0; j <m[i].length; j++) {//**********Found**********if ( m[a][b] < m[i][j]) {a = i;b = j;}}}//**********Found**********System.out.println("max=" +  m[a][b] + ",row=" + a + ",col=" + b);
}

}

1.51

public class Java_1 {

public static void main(String[] args) {
​int[] scores = {82, 75, 42, 92, 85, 78, 93, 65};int i;
​int sum = scores[0];//**********Found**********int max = 0;
​//**********Found**********for (i = 1; i < scores.length; i++) {//**********Found**********sum += scores[i];if (max < scores[i] ) { max = scores[i];}}
​//**********Found**********System.out.println("平均值：" + (float)sum/ i);System.out.println("最大值：" + max);
}

}

1.52（star）

import java.util.*; public class Java_1{ public static void main(String[] args){ int[] a = new int[15]; int i, j, k;

       int[][] b = new int[5][];for (i = 0; i < b.length; i++)//**********Found********** b[i] = new int[i+1];//**********Found**********Scanner scan = new Scanner(System.in);for (i = 0; i < a.length; i++) //**********Found**********a[i] = scan.nextInt();
​k = 0;for (i = 0; i < b.length; i++) {//**********Found**********for (j = 0; j <b[i].length; j++) {//**********Found**********b[i][j] = a[k++];System.out.print(String.format("%5d",b[i][j]));}System.out.println();}}

}

1.53

public class Java_1 {

public static void main(String args[]) {int a = 3, d = 4;//**********Found********** int s = a;//**********Found**********       for (int i = 1; i <= 9;i++) {//**********Found********** a = a+d;//**********Found********** s += a;}System.out.println("前十项的和为 " + s);
}

}

1.54

import java.util.Scanner; public class Java_1 {

public static void main(String[] args) {int []a = new int[10];int s = 0,n = 0;//**********Found********** Scanner scan = new Scanner(System.in);//**********Found********** for(int i=0;i<a.length;i++){//**********Found********** a[i] = scan.nextInt();if(a[i]%2==0){//**********Found********** s += a[i];//**********Found********** n = n+1;}}if(n!=0)System.out.println("偶数的平均值是 " + s/n);
}

}

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