test.java

该程序可将一个四则混合运算分解成一组四元式指令。

/**
 * 主类，构造一个JFrame窗口，把输入输出界面加到该窗口中
 * 该类含有main方法，是程序的入口
 */
package ex2;

import java.awt.AWTEvent;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;

/**
 * @author 阿赞
 *
 */
public class Test extends JFrame{
	MyFrame myframe = new MyFrame();
	Dimension faceSize=new Dimension(600,400);
	Container cp=getContentPane();
	public Test() {
		enableEvents(AWTEvent.WINDOW_EVENT_MASK);
		this.setSize(faceSize);//设置框架大小
		this.setTitle("输出简单四则运算表达式的四元式");//设置标题
		this.setResizable(false);
		cp.setLayout(new BorderLayout());
		cp.add("North",myframe.getJPanel());
		addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){dispose();}});//增加对话框窗口适配器(事件监听者)
		this.pack();
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		//String expression = "x=a+b*(c+d)-e/(f-(g+h)*i)+j";
		//String expression = "x=a*b+c";
		//String expression = "x=a+b*c";
		//String expression = "x=a+b*c/d-e/f+g-h";
		//System.out.println(expression.length());
		//new EX2(expression);
		Test test = new Test();
		Dimension screenSize=Toolkit.getDefaultToolkit().getScreenSize();
		Dimension frameSize=test.getSize();
		if(frameSize.height>screenSize.height)
		{
			frameSize.height=screenSize.height;
		}
		if(frameSize.width>screenSize.width)
		{
			frameSize.width=screenSize.width;
		}
		test.setLocation((screenSize.width-frameSize.width)/2,(screenSize.height-frameSize.height)/2);
		test.setVisible(true);
	}

}