java图形界面 计算器实现
编写程序实现一个简单计算器的基本功能，具体可以模仿Windows附件中的计算器或模拟常见的实物计算器。
package beizi;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTextArea;
import javax.swing.JTextPane;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import java.awt.TextArea;
import java.awt.Color;
import javax.swing.JTextField;
public class cal {
private JFrame frame;
private JTextField textField;
private JTextField textField_1;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
cal window = new cal();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public cal() {
initialize();
// calResult();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
JButton btnNewButton = new JButton("1");
btnNewButton.setBackground(Color.LIGHT_GRAY);
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"1");
}
});
btnNewButton.setBounds(33, 142, 68, 38);
frame.getContentPane().add(btnNewButton);
JButton button = new JButton("4");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"4");
}
});
button.setBackground(Color.LIGHT_GRAY);
button.setBounds(33, 194, 68, 38);
frame.getContentPane().add(button);
JButton button_1 = new JButton("7");
button_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"7");
}
});
button_1.setBackground(Color.LIGHT_GRAY);
button_1.setBounds(33, 242, 68, 38);
frame.getContentPane().add(button_1);
JButton button_2 = new JButton("2");
button_2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"2");
}
});
button_2.setBackground(Color.LIGHT_GRAY);
button_2.setBounds(111, 142, 68, 38);
frame.getContentPane().add(button_2);
JButton button_3 = new JButton("5");
button_3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"5");
}
});
button_3.setBackground(Color.LIGHT_GRAY);
button_3.setBounds(111, 194, 68, 38);
frame.getContentPane().add(button_3);
JButton button_4 = new JButton("8");
button_4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"8");
}
});
button_4.setBackground(Color.LIGHT_GRAY);
button_4.setBounds(111, 242, 68, 38);
frame.getContentPane().add(button_4);
JButton button_5 = new JButton("3");
button_5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"3");
}
});
button_5.setBackground(Color.LIGHT_GRAY);
button_5.setBounds(189, 142, 68, 38);
frame.getContentPane().add(button_5);
JButton button_6 = new JButton("6");
button_6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"6");
}
});
button_6.setBackground(Color.LIGHT_GRAY);
button_6.setBounds(189, 194, 68, 38);
frame.getContentPane().add(button_6);
JButton button_7 = new JButton("9");
button_7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"9");
}
});
button_7.setBackground(Color.LIGHT_GRAY);
button_7.setBounds(189, 242, 68, 38);
frame.getContentPane().add(button_7);
JButton button_8 = new JButton("0");
button_8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"0");
}
});
button_8.setBackground(Color.LIGHT_GRAY);
button_8.setBounds(111, 290, 68, 38);
frame.getContentPane().add(button_8);
JButton button_9 = new JButton("(");
button_9.setBackground(Color.ORANGE);
button_9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"(");
}
});
button_9.setBounds(33, 93, 68, 38);
frame.getContentPane().add(button_9);
JButton button_10 = new JButton(")");
button_10.setBackground(Color.ORANGE);
button_10.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+")");
}
});
button_10.setBounds(109, 94, 70, 38);
frame.getContentPane().add(button_10);
JButton button_11 = new JButton("+");
button_11.setBackground(Color.ORANGE);
button_11.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"+");
}
});
button_11.setBounds(267, 142, 44, 38);
frame.getContentPane().add(button_11);
JButton button_12 = new JButton("-");
button_12.setBackground(Color.ORANGE);
button_12.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"-");
}
});
button_12.setBounds(267, 194, 44, 38);
frame.getContentPane().add(button_12);
JButton button_13 = new JButton("*");
button_13.setBackground(Color.ORANGE);
button_13.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"*");
}
});
button_13.setBounds(267, 242, 44, 38);
frame.getContentPane().add(button_13);
JButton button_14 = new JButton("/");
button_14.setBackground(Color.ORANGE);
button_14.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"/");
}
});
button_14.setBounds(267, 290, 44, 38);
frame.getContentPane().add(button_14);
JButton button_15 = new JButton("=");
button_15.setBackground(Color.GREEN);
button_15.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
ScriptEngine js = new ScriptEngineManager().getEngineByName("JavaScript");//将字符串公式转换为计算公式
String formula=textField.getText();
try {
textField_1.setText(js.eval(formula).toString());
// textField_1.set
}catch(Exception e) {
}
}
});
button_15.setBounds(334, 252, 44, 76);
frame.getContentPane().add(button_15);
textField = new JTextField();
textField.setBounds(33, 21, 345, 37);
frame.getContentPane().add(textField);
textField.setColumns(10);
textField_1 = new JTextField();
textField_1.setBackground(Color.WHITE);
textField_1.setBounds(189, 94, 189, 37);
frame.getContentPane().add(textField_1);
textField_1.setColumns(10);
JButton button_16 = new JButton("C");
button_16.setBackground(Color.MAGENTA);
button_16.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
int t=text.length()-1;
if(t<0) {
JOptionPane.showMessageDialog(null, "已经没有了((");
}
else {
text=text.substring(0, t);
textField.setText(text);
}
}
});
button_16.setBounds(334, 142, 44, 38);
frame.getContentPane().add(button_16);
JButton button_17 = new JButton("X");
button_17.setBackground(Color.RED);
button_17.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
textField.setText("");
textField_1.setText("");
}
});
button_17.setBounds(334, 202, 44, 38);
frame.getContentPane().add(button_17);
JButton button_18 = new JButton(".");
button_18.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+".");
}
});
button_18.setBackground(Color.ORANGE);
button_18.setBounds(33, 290, 68, 38);
frame.getContentPane().add(button_18);
JButton button_19 = new JButton("%");
button_19.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String text=textField.getText();
textField.setText(text+"%");
}
});
button_19.setBackground(Color.ORANGE);
button_19.setBounds(189, 290, 68, 38);
frame.getContentPane().add(button_19);
}
}
大概的效果，Java初学者，，代码重复严重，以后改，，，
