exceptiontest.java

PracticalJAVACode 的源码

import java.io.IOException;
import java.awt.Button;
import java.util.Vector;

class ExceptionTest {
  public static void main (String args[])
  {
    System.out.println("Entering main()");
    ExceptionTest et = new ExceptionTest();
    try {
      System.out.println("Calling m1()");
      et.m1();
      System.out.println("Returning from call to m1()");      //1
    }
    catch (Exception e) {
      System.out.println("Caught IOException in main()");
    }
    System.out.println("Exiting main()");
  }

  public void m1() throws IOException
  {
    System.out.println("Entering m1()");
    Button b1 = new Button();
    try {
      System.out.println("Calling m2()");
      m2();
      System.out.println("Returning from call to m2()");
      System.out.println("Calling m3()");
      m3(true);
      System.out.println("Returning from call to m3()");      //2
    }
    catch (IOException e) {
      System.out.println("Caught IOException in " +
                         "m1()...rethrowing");
      throw e;                                                //3
    }
    finally {
      System.out.println("In finally for m1()");
    }
    System.out.println("Exiting m1()");                       //4
  }

  public void m2()
  {
    System.out.println("Entering m2()");
    try {
      Vector v = new Vector(5);
    }
    catch (IllegalArgumentException iae) {
      System.out.println("Caught " +
        "IllegalArgumentException in m2()");                  //5
    }
    finally {
      System.out.println("In finally for m2()");
    }
    System.out.println("Exiting m2()");
  }

  public void m3(boolean genExc) throws IOException
  {
    System.out.println("Entering m3()");
    try {
      Button b3 = new Button();
      if (genExc)
        throw new IOException();
    }
    finally {
      System.out.println("In finally for m3()");
    }
    System.out.println("Exiting m3()");                       //6
  }
}