选择整数计算

问题描述

• 使用复选框显示给定的一组整数，如图所示，选中一些；
• 单击“全选”按钮，选中所有的复选框；
• 单击“多项选择”按钮，将多个选中整数显示在文本行数组中；
• 在文本行中输入整数，单击“求和”按钮，将各文本行中的非空字符串转换成整数，再计算和并显示结果。
• 若字符串不能转换成整数，采用对话框提示忽略它，并将该文本行清空。

增加要求

1. 框架构造方法的参数指定整数个数；
2. 使用复选框数组和文本框数组；
3. 声明对文本行数组的计算方法如下

public int sum(JTextField[] texts) //计算文本行数组之和，忽略其中""和不能转换成整数的字符串

代码如下

package book;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class AWT extends Frame implements ActionListener{
	JTextField [] textbox = new JTextField[6];
	JCheckBox [] checkboxs = new JCheckBox[6];
	TextField sumField = new TextField();
	Button button1,button2,button3;
	
	public AWT() {
		super("选择整数计算");
		this.setBounds(0, 0, 400, 360);
		this.setLayout(null);
		String [] str = {"57","15","78","23","51","59"};
		//JPanel panel = new JPanel();
		for(int i=0;i<str.length;i++) {
			checkboxs[i] = new JCheckBox(str[i]);
			textbox[i] = new JTextField();
			this.add(checkboxs[i]);
			this.add(textbox[i]);
			checkboxs[i].setBounds(20 , 30+40*i , 60, 40);
			//checkboxs[i].setBounds(x, y, width, height);
			textbox[i].setBounds(100 , 40+40*i, 100, 20);
			//textbox[i].setText(str[i]);
			//checkboxs[i].setFont(new Font("Arial",1,20));
			//checkboxs[i].setSize(width, height);
			//checkboxs[i].setSize(30, 30);
		}
		//this.add(panel);
		this.button1 = new Button("全选");
		button1.setBounds(20, 300, 70, 30);
		this.add(button1);
		button1.addActionListener(this);
		this.button2 = new Button("多项选择");
		button2.setBounds(100, 300, 70, 30);
		this.add(button2);
		button2.addActionListener(this);
		this.button3 = new Button("求和");
		button3.setBounds(180, 300, 70, 30);
		this.add(button3);
		button3.addActionListener(this);
		this.sumField.setBounds(260,300 , 70, 30);
		this.sumField.setFont(new Font("TimesRoman",0,18));
		this.add(sumField);
		this.setVisible(true);
		this.addWindowListener(new WinClose());
	}
	public void Function() {
		for(int i=0;i<checkboxs.length;i++) {
			if(!checkboxs[i].isSelected())
				checkboxs[i].doClick();
		}
		for(int i=0;i<checkboxs.length;i++)
			if(checkboxs[i].isSelected()) {
				textbox[i].setText(checkboxs[i].getText());
			}
	}
	public void Function2() {
		for(int i=0;i<checkboxs.length;i++)
			if(checkboxs[i].isSelected()) {
				textbox[i].setText(checkboxs[i].getText());
			}
	}
	public int sum(JTextField[] texts) {
		int s=0;
		for(int i=0;i<texts.length;i++) {
			try {
				if(checkboxs[i].isSelected()&&!(texts[i].getText()==""))
				s+=Integer.parseInt(texts[i].getText());
			}
			catch (Exception e) {
				// TODO: handle exception
				JOptionPane.showMessageDialog(null,"\""+texts[i].getText()+"\" 不能转换成整数，忽略","消息",JOptionPane.INFORMATION_MESSAGE);
				textbox[i].setText("");
			}
		}
		//sumField.setText(Integer.toString(s));
		return s;
	}
	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		if(e.getSource() == this.button1) {
			Function();
		}
		if(e.getSource() == this.button2) {
			Function2();
		}
		if(e.getSource() == this.button3) {
			sumField.setText(Integer.toString(sum(textbox)));;
		}
		for(int i=0;i<textbox.length;i++) {
			if(checkboxs[i].isSelected())
				textbox[i].setText(checkboxs[i].getText());
			else
				textbox[i].setText("");
		}
	}
	
	public static void main(String[] args) {	new AWT();	}
	public class WinClose implements WindowListener{

		@Override
		public void windowOpened(WindowEvent e) {
			// TODO Auto-generated method stub
			
		}

		@Override
		public void windowClosing(WindowEvent e) {
			// TODO Auto-generated method stub
			System.exit(0);
		}

		@Override
		public void windowClosed(WindowEvent e) {
			// TODO Auto-generated method stub
			
		}

		@Override
		public void windowIconified(WindowEvent e) {
			// TODO Auto-generated method stub
			
		}

		@Override
		public void windowDeiconified(WindowEvent e) {
			// TODO Auto-generated method stub
			
		}

		@Override
		public void windowActivated(WindowEvent e) {
			// TODO Auto-generated method stub
			
		}

		@Override
		public void windowDeactivated(WindowEvent e) {
			// TODO Auto-generated method stub
			
		}		
	}	
}