findthreadproblem.java

递归子程序法：对应每个非终结符语法单元编一个独立的处理过程（或子程序）。语法分析从读入第一个单词开始

	/** 
	 * Java语言实验参考程序
	 * Company 北京师范大学计算机系
 
	 * @author 孙一林
	 * @version 1.0
	 */
	public class FindThreadProblem {
	  public static void main(String args[]) {
		ExchangeVariable thread1,thread2;
		thread1 = new ExchangeVariable();
		thread2 = new ExchangeVariable();
		thread1.start();
		thread2.start();
		try {
		  Thread.sleep( 1000 );
		}
		catch(InterruptedException e) {
		} 
	  }
	}
	class ExchangeVariable extends Thread {
	  int Variable1;
	  int Variable2;
	  public ExchangeVariable() {
		int temp = Variable1;
		Variable1 = Variable2;
		Variable2 = temp;
	  }
	}