重载：方法名相同，参数列表不同，与返回值类型无关
重载的分类：
1，参数个数不同 ①，④，⑤，⑥；
2，参数类型不同 ①，②，③、 ⑤，⑥；
Ⅰ， 顺序不同 ②，③；
public class overload {public static void main(String[] args) {int sum1 = add(10,20);System.out.println(sum1);double sum2 = add(10.1,20);System.out.println(sum2);double sum3 = add(10,20.2);System.out.println(sum3);double sum4 = add(10,20,30);System.out.println(sum4);int sum5 = add(10,20,30,40);System.out.println(sum5);double sum6 = add(10.1,20.2,30.3,40.4);System.out.println(sum6);}
① public static int add (int a,int b){return a + b ;}
② public static double add (double a,int b){return a + b ;}
③ public static double add (int a,double b){return a + b ;}
④ public static double add (int a,int b, int c){return a + b + c ;}
⑤ public static int add (int a,int b, int c, int d){return a + b + c + d ;}
⑥ public static double add (double a,double b, double c, double d){return a + b + c + d ;}
}
题目：比较两个数据是否相等
参数类型分别为两个int，两个double类型，并在main方法中进行测试
public class bijiao {public static void main(String[] args) {boolean a = isEquals(10,20);System.out.println(a);boolean b = isEquals(20.2,20.2);System.out.println(b);}public static boolean isEquals(int a,int b){return a==b;}public static boolean isEquals(double a,double b){return a==b;}
}
)
)
)