test.java

了解Java语言的发展历史和Java平台的应用划分。 了解Java语言的特点及其实际应用领域。 了解Java开发环境及开发工具

class Test
{
  public static void main(String args[])
  {
    int val;
    StringBuffer sb1, sb2;
    val = 10;
    sb1 = new StringBuffer("apples");
    sb2 = new StringBuffer("pears");
    System.out.println("val is " + val);
    System.out.println("sb1 is " + sb1);
    System.out.println("sb2 is " + sb2);
    System.out.println("calling modify");
    modify(val, sb1, sb2);
    System.out.println("returned from modify");
    System.out.println("val is " + val);
    System.out.println("sb1 is " + sb1);
    System.out.println("sb2 is " + sb2);
  }
  public static void modify(int a, StringBuffer r1, StringBuffer r2)
  {
      System.out.println("in modify...");
      a = 0;
      r1 = null; 
      r2.append(" taste good");
      System.out.println("a is " + a);
      System.out.println("r1 is " + r1);
      System.out.println("r2 is " + r2);
  }
}