动手动脑4

import java.io.*;
public class ThrowMultiExceptionsDemo { public static void main(String[] args) { try { throwsTest(); } catch(IOException e) { System.out.println("捕捉异常"); }}private static void throwsTest()  throws ArithmeticException,IOException { System.out.println("这只是一个测试"); // 程序处理过程假设发生异常throw new IOException(); //throw new ArithmeticException(); 
    } 
}

public class CatchWho { public static void main(String[] args) { try { try { throw new ArrayIndexOutOfBoundsException(); } catch(ArrayIndexOutOfBoundsException e) { System.out.println(  "ArrayIndexOutOfBoundsException" +  "/内层try-catch"); }throw new ArithmeticException(); } catch(ArithmeticException e) { System.out.println("发生ArithmeticException"); } catch(ArrayIndexOutOfBoundsException e) { System.out.println(  "ArrayIndexOutOfBoundsException" + "/外层try-catch"); } } 
}

CatchWho2.java
public class CatchWho2 { public static void main(String[] args) { try {try { throw new ArrayIndexOutOfBoundsException(); } catch(ArithmeticException e) { System.out.println( "ArrayIndexOutOfBoundsException" + "/内层try-catch"); }throw new ArithmeticException(); } catch(ArithmeticException e) { System.out.println("发生ArithmeticException"); } catch(ArrayIndexOutOfBoundsException e) { System.out.println( "ArrayIndexOutOfBoundsException" + "/外层try-catch"); } } 
}

CheckedExceptionDemo.java
import java.io.*; public class CheckedExceptionDemo { public static void main(String[] args)  { try { BufferedReader buf = new BufferedReader( new InputStreamReader(System.in));    //抛出受控的异常System.out.print("请输入整数: "); int input = Integer.parseInt(buf.readLine()); //有可能引发运行时异常System.out.println("input x 10 = " + (input*10)); } //以下异常处理语句块是必须的，否则无法通过编译catch(IOException e) { System.out.println("I/O错误"); } //以下异常处理语句块可以省略，不影响编译，但在运行时出错catch(NumberFormatException e) { System.out.println("输入必须为整数"); }} 
}

EmbededFinally.javapublic class EmbededFinally {public static void main(String args[]) {int result;try {System.out.println("in Level 1");try {System.out.println("in Level 2");// result=100/0;  //Level 2try {System.out.println("in Level 3");result=100/0;  //Level 3
                } catch (Exception e) {System.out.println("Level 3:" + e.getClass().toString());}finally {System.out.println("In Level 3 finally");}// result=100/0;  //Level 2
}catch (Exception e) {System.out.println("Level 2:" + e.getClass().toString());}finally {System.out.println("In Level 2 finally");}// result = 100 / 0;  //level 1
        } catch (Exception e) {System.out.println("Level 1:" + e.getClass().toString());}finally {.             System.out.println("In Level 1 finally");}}}

ExceptionLinkInRealWorld.java
/*** 自定义的异常类* @author JinXuLiang**/
class MyException extends Exception
{public MyException(String Message) {super(Message);}public MyException(String message, Throwable cause) {super(message, cause);}public MyException( Throwable cause) {super(cause);}}public class ExceptionLinkInRealWorld {public static void main( String args[] ){try {throwExceptionMethod();  //有可能抛出异常的方法调用
      }catch ( MyException e ){System.err.println( e.getMessage() );System.err.println(e.getCause().getMessage());}catch ( Exception e ){System.err.println( "Exception handled in main" );}doesNotThrowException(); //不抛出异常的方法调用
   }public static void throwExceptionMethod() throws MyException{try {System.out.println( "Method throwException" );throw new Exception("系统运行时引发的特定的异常");  // 产生了一个特定的异常
      }catch( Exception e ){System.err.println("Exception handled in method throwException" );//转换为一个自定义异常，再抛出throw new MyException("在方法执行时出现异常",e);}finally {System.err.println("Finally executed in throwException" );}// any code here would not be reached
   }public static void doesNotThrowException(){try {System.out.println( "Method doesNotThrowException" );}catch( Exception e ){System.err.println( e.toString() );}finally {System.err.println("Finally executed in doesNotThrowException" );}System.out.println("End of method doesNotThrowException" );}
}

ExplorationJDKSource.javapublic class ExplorationJDKSource {/*** @param args*/public static void main(String[] args) {System.out.println(new A());}}class A{}

OverrideThrows.javaimport java.io.*;public class OverrideThrows
{public void test()throws IOException{FileInputStream fis = new FileInputStream("a.txt");}
}
class Sub extends OverrideThrows
{//如果test方法声明抛出了比父类方法更大的异常,比如Exception//则代码将无法编译……public void test() throws FileNotFoundException{//...
    }
}+
// UsingExceptions.java
// Demonstrating the getMessage and printStackTrace
// methods inherited into all exception classes.
public class PrintExceptionStack {public static void main( String args[] ){try {method1();}catch ( Exception e ) {System.err.println( e.getMessage() + "\n" );e.printStackTrace();}}public static void method1() throws Exception{method2();}public static void method2() throws Exception{method3();}public static void method3() throws Exception{throw new Exception( "Exception thrown in method3" );}
}public class SystemExitAndFinally {public static void main(String[] args){try{System.out.println("in main");throw new Exception("Exception is thrown in main");//System.exit(0);
}catch(Exception e){System.out.println(e.getMessage());System.exit(0);}finally{System.out.println("in finally");}}}

ThrowDemo.java
public class ThrowDemo { public static void main(String[] args) { 
//        try {double data = 100 / 0.0;System.out.println("浮点数除以零：" + data); 
//            if(String.valueOf(data).equals("Infinity"))
//            { 
//                System.out.println("In Here" ); 
//                throw new ArithmeticException("除零异常");
//            }
//        } 
//        catch(ArithmeticException e) { 
//            System.out.println(e); 
//        } 
    } 
}

import java.io.*;
public class ThrowMultiExceptionsDemo { public static void main(String[] args) { try { throwsTest(); } catch(IOException e) { System.out.println("捕捉异常"); }}private static void throwsTest()  throws ArithmeticException,IOException { System.out.println("这只是一个测试"); // 程序处理过程假设发生异常throw new IOException(); //throw new ArithmeticException(); 
    } 
}