简明现代魔法 -> Java编程语言 -> SWT之路：猜数字游戏

SWT之路：猜数字游戏

2009-10-04

程序运行结果

程序代码

package SWT;

import java.util.Random;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class Guess {

	protected Shell shell;
	private Text text;
	static Label resultShow;
	int num_Guess;
	static int num_Random;
	int count = 1;

	/**
	 * Launch the application.
	 * @param args
	 */
	public static void main(String[] args) {
		
		num_Random = randomNumberGenerator();
		
		/*
		Random rand = new Random();
		num_Random = rand.nextInt(100);
		System.out.println(num_Random);
		*/
		
		System.out.println(num_Random);
		
		try {
			Guess window = new Guess();
			window.open();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Open the window.
	 */
	public void open() {
		Display display = Display.getDefault();
		createContents();
		shell.open();
		shell.layout();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
	}

	/**
	 * Create contents of the window.
	 */
	protected void createContents() {
		shell = new Shell();
		shell.setSize(450, 300);
		shell.setText("猜数字游戏");
		{
			Group group = new Group(shell, SWT.NONE);
			group.setText("输入数字");
			group.setBounds(10, 10, 422, 115);
			{
				text = new Text(group, SWT.BORDER);
				text.setBounds(193, 27, 70, 18);
			}
			{
				Button button = new Button(group, SWT.NONE);
				button.setBounds(193, 61, 72, 22);
				button.setText("猜一下");
				button.addSelectionListener(new SelectionAdapter() {    
                    public void widgetSelected(SelectionEvent e) {    
                        num_Guess = Integer.parseInt(text.getText());
                        tip();
                        count ++;
                    }    
                });
			}
			{
				Label label = new Label(group, SWT.NONE);
				label.setBounds(10, 31, 171, 12);
				label.setText("请输入一个1-100范围内的整数：");
			}
		}
		{
			Group group = new Group(shell, SWT.NONE);
			group.setText("结果显示");
			group.setBounds(10, 141, 422, 115);
			{
				resultShow = new Label(group, SWT.NONE);
				resultShow.setAlignment(SWT.CENTER);
				resultShow.setBounds(10, 52, 402, 53);
				resultShow.setText("");
			}
		}

	}
	
	public static int randomNumberGenerator() {
		Random rand = new Random();
		int i = rand.nextInt(100);
		return i;
	}
	
	public void tip() {  
		  
	        num_Guess = Integer.parseInt(text.getText());  
	        if (num_Random > num_Guess) {  
	        	resultShow.setText("没那么小啦，你猜了 " + count + " 次了哦");  
	            text.setText("");  
	            text.forceFocus();  
	        } else if (num_Random < num_Guess) {  
	        	resultShow.setText("没那么大啦，你猜了 " + count + " 次了哦");  
	            text.setText("");  
	            text.forceFocus();  
	        } else if (num_Random == num_Guess) {  
	        	resultShow.setText("厉害！猜对了，你总共猜了 " + count + " 次了");  
	        }  
	    }   
}

程序编写了两个方法。randomNumberGenerator() 用于产生随机数字，tips() 用于比较用户输入的数字与目标数字，产生提示信息。 在主方法调用randomNumberGenerator()方法时，该调用语句必须在异常捕抓之前。text.forceFocus(); 可以让焦点重新回到输入框。

调用tips()方法在按钮事件中进行，同时只要点一下按钮，计数变量count就自增，实现计数。