Java实训普通简单_简单计算器（Java实训）

package program8;

import java.awt.EventQueue;

import javax.swing.JFrame;

import javax.swing.JTextArea;

import javax.swing.JTextField;

import javax.script.ScriptEngine;

import javax.script.ScriptEngineManager;

import javax.script.ScriptException;

import javax.swing.JButton;

import javax.swing.JPanel;

import java.awt.GridLayout;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.awt.Font;

public class Test {

static String input = "";

private JFrame frame;

/**

* Launch the application.

*/

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

Test window = new Test();

window.frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

/**

* Create the application.

*/

public Test() {

initialize();

}

/**

* Initialize the contents of the frame.

*/

private void initialize() {

frame = new JFrame();

frame.setTitle("\u8BA1\u7B97\u5668");

frame.setBounds(100, 100, 400, 488);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JTextField textArea = new JTextField();

textArea.setFont(new Font("Monospaced", Font.PLAIN, 30));

textArea.setBounds(0, 0, 286, 96);

JButton btnCe = new JButton("CE");

btnCe.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnCe.getText();

set_text(textArea,text);

}

});

btnCe.setBounds(287, 0, 95, 94);

frame.getContentPane().setLayout(null);

frame.getContentPane().add(textArea);

frame.getContentPane().add(btnCe);

JPanel panel = new JPanel();

panel.setBounds(0, 96, 382, 344);

frame.getContentPane().add(panel);

panel.setLayout(new GridLayout(4, 4));

JButton btnNewButton = new JButton("7");

btnNewButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton);

JButton btnNewButton_1 = new JButton("8");

btnNewButton_1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_1.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_1);

JButton btnNewButton_3 = new JButton("9");

btnNewButton_3.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_3.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_3);

JButton btnNewButton_4 = new JButton("/");

btnNewButton_4.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_4.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_4);

JButton btnNewButton_2 = new JButton("4");

btnNewButton_2.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_2.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_2);

JButton btnNewButton_6 = new JButton("5");

btnNewButton_6.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_6.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_6);

JButton btnNewButton_5 = new JButton("6");

btnNewButton_5.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_5.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_5);

JButton btnNewButton_8 = new JButton("*");

btnNewButton_8.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_8.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_8);

JButton btnNewButton_12 = new JButton("1");

btnNewButton_12.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_12.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_12);

JButton btnNewButton_9 = new JButton("2");

btnNewButton_9.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_9.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_9);

JButton btnNewButton_7 = new JButton("3");

btnNewButton_7.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_7.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_7);

JButton btnNewButton_13 = new JButton("-");

btnNewButton_13.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_13.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_13);

JButton btnNewButton_10 = new JButton(".");

btnNewButton_10.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_10.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_10);

JButton btnNewButton_11 = new JButton("0");

btnNewButton_11.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_11.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_11);

JButton btnNewButton_14 = new JButton("=");

btnNewButton_14.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_14.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_14);

JButton btnNewButton_15 = new JButton("+");

btnNewButton_15.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=btnNewButton_15.getText();

set_text(textArea,text);

}

});

panel.add(btnNewButton_15);

}

public static void set_text(JTextField tf,String s){

if(s.equals("=")){

//进行字符串表达式的运算

ScriptEngineManager scriptEngineManager = new ScriptEngineManager();

ScriptEngine scriptEngine = scriptEngineManager.getEngineByName("nashorn");

try{

input = String.valueOf(scriptEngine.eval(input));

tf.setText(input);

}catch(ScriptException e){

e.printStackTrace();

}

}

else if(s.equals("CE")){

input = "";

tf.setText(input);

}

else{

input = input + s;

tf.setText(input);

}

}

}