java简单界面计算器.docx

package calculator;import java.awt.BorderLayout;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField;/* * * author 某某某 * */public class Calculator extends JFrame implements ActionListener /设计按钮数组1包含数字键和删除键DEL和清屏键,小数点。 JButton but1 = new JButton(1),new JButton(2),new JButton(3),new JButton(4),new JButton(5),new JButton(6),new JButton(7),new JButton(8),new JButton(9),new JButton(.),new JButton(0),new JButton(del);/设计按钮数组2包含加减乘除，开根号，取余，等于键，平方，三次方。JButton but2 = new JButton(+),new JButton(-),new JButton(*),new JButton(/),new JButton(2),new JButton(3),new JButton(%),new JButton(sqrt),new JButton(exit),new JButton(=),new JButton(AC) ;/创建一个单行文本JTextField text = new JTextField(25);/创建五个面板JPanel jp1 = new JPanel();JPanel jp2 = new JPanel();JPanel jp3 = new JPanel();JPanel jp4 = new JPanel();JPanel jp5 = new JPanel();/创建有关状态变量boolean clicked = true;/是否有小数点boolean clear = true;/是否应该清屏double num1,num2;/两次输入的数字String sign;/用户点击的运算符号/主要界面设计public Calculator()this.setVisible(true);this.setTitle(my calculator);this.setSize(300,250);this.setLocation(400, 400);text.setHorizontalAlignment(JTextField.RIGHT);/设计各面板的格式jp1.setLayout(new GridLayout(1,1);jp2.setLayout(new GridLayout(4,3);jp3.setLayout(new GridLayout(4,1);jp4.setLayout(new GridLayout(4,1);jp5.setLayout(new GridLayout(1,1);/设置整体布局/面板一种只有一个单行文本 放在NORTH。this.add(jp1,BorderLayout.NORTH);jp1.add(text); text.setEditable(false); /面板二是数字面板还包括小数点和Del键，放在CENTERthis.add(jp2,BorderLayout.CENTER);/循环向面板二中添加按钮,并添加监听者for (int i = 0; i but1.length; i+) jp2.add(but1i);but1i.addActionListener(this);/面板三是加减乘除，放在EASTthis.add(jp3,BorderLayout.EAST);/循环向面板中添加按钮,并添加监听者for (int i = 0; i 4; i+) jp3.add(but2i);but2i.addActionListener(this);/面板四是平方，三次方，取余，开方，放在WEST。this.add(jp4,BorderLayout.WEST);/循环向里面添加按钮，并添加监听者for (int i = 4; i 8; i+) jp4.add(but2i);but2i.addActionListener(this);/面板五是exit键，等于键，和清屏键，放在SOUTH。this.add(jp5,BorderLayout.SOUTH);/循环向其中添加按钮，并添加监听者for (int i = 8; i but2.length; i+) jp5.add(but2i);but2i.addActionListener(this);/监听设置public void actionPerformed(ActionEvent e) /del键if(e.getActionCommand() = del)String s = text.getText();text.setText(null);for (int i = 0; i s.length()-1; i+) char a = s.charAt(i);text.setText(text.getText() + a);/AC键（清零）if(e.getActionCommand() = AC)text.setText(null);clear = true;if(e.getActionCommand() = 0)if(clear = false)text.setText(null);text.setText(text.getText()+0);clear = true;if(e.getActionCommand() = 1)if(clear = false)text.setText(null);text.setText(text.getText()+1);clear = true;if(e.getActionCommand() = 2)if(clear = false)text.setText(null);text.setText(text.getText()+2);clear = true;if(e.getActionCommand() = 3)if(clear = false)text.setText(null);text.setText(text.getText()+3);clear = true;if(e.getActionCommand() = 4)if(clear = false)text.setText(null);text.setText(text.getText()+4);clear = true;if(e.getActionCommand() = 5)if(clear = false)text.setText(null);text.setText(text.getText()+5);clear = true;if(e.getActionCommand() = 6)if(clear = false)text.setText(null);text.setText(text.getText()+6);clear = true;if(e.getActionCommand() = 7)if(clear = false)text.setText(null);text.setText(text.getText()+7);clear = true;if(e.getActionCommand() = 8)if(clear = false)text.setText(null);text.setText(text.getText()+8);clear = true;if(e.getActionCommand() = 9)if(clear = false)text.setText(null);text.setText(text.getText()+9);clear = true;/小数点键if(e.getActionCommand() = .)clicked = true;for (int i = 0; i text.getText().length(); i+) if(. = text.getText().charAt(i)clicked = false;break;if(clicked = true)text.setText(text.getText()+.);/加减乘除键if(e.getActionCommand() = +)if(clear = true)num1 = Double.parseDouble(text.getText();text.setText(null);text.setText(text.getText()+);sign = +;clear = false;if(e.getActionCommand() = -)num1 = Double.parseDouble(text.getText();sign = -;clear = false;if(e.getActionCommand() = *)num1 = Double.parseDouble(text.getText();sign = *;clear = false;if(e.getActionCommand() = /)num1 = Double.parseDouble(text.getText();sign = /;clear = false;/等于键if(e.getActionCommand() = =) num2 = Double.parseDouble(text.getText();text.setText(null);if(sign = +)text.setText(num1 + num2+);if(sign = -)text.setText(num1 - num2+);if(sign = *)text.setText(num1 * num2+);if(sign = /)if(num2 = 0)text.setText(除数不能为零);elsetext.setText(num1 / num2+);if(sign = %)if(num2 = 0)text.setText(error!);elsetext.setText(num1 % num2+);clear = false;if(e.getActionCommand() = sqrt)String s = text.getText();if(s.charAt(0)=-)text.setText(根号下的数不能小于零);elsetext.setText(Double.toString(Math.sqrt(Double.parseDouble(text.getText();clear = false;if(e.getActionCommand() = %)num1 = Double.parseDouble(text.getText();sign = %;clear = false;if(e.getActionCommand() = 2)num1 = Double.parseDouble(text.get