import java.awt.*;
//import java.util.*;
import javax.swing.*;//import java.awt.event.*;
public class CalFrame extends JFrame {
/**
*
*/
private static final long serialVersionUID = 833449942376457328L;
JPanel Main1, Main2,Main3;
JButton btncount, btnclean;
JLabel lbnnumber1, lbnnumber2, lbresult;
JTextField tetumber1, tetumber2, tetresult;
JRadioButton rbj, rbji, rbche, rbchu;
public CalFrame() {
super("简易计算器");
lbnnumber1 = new JLabel("第一个数");
lbnnumber2 = new JLabel("第二个数");
lbresult = new JLabel("结 果");
tetumber1 = new JTextField(10);
tetumber2 = new JTextField(10);
tetresult = new JTextField(10);
rbj = new JRadioButton("+");
//rbj.setSelected(true);
rbji = new JRadioButton("-");
rbche = new JRadioButton("*");
rbchu = new JRadioButton("/");
btncount = new JButton("计算");
btnclean = new JButton("清除");
Main1 = new JPanel();
Main1.setLayout(new GridLayout(3, 2));
Main2 = new JPanel();
Main3 = new JPanel();
Main1.add(lbnnumber1);
Main1.add(tetumber1);
Main1.add(lbnnumber2);
Main1.add(tetumber2);
Main1.add(lbresult);
Main1.add(tetresult);
Main2.add(rbj);
Main2.add(rbji);
Main2.add(rbche);
Main2.add(rbchu);
Main2.add(btncount);
Main2.add(btnclean);
Main3.add(Main1);
Main3.add(Main2);
// ((RootPaneContainer) Main3).setContentPane(Main3);*/
this.add(Main3); //Add panel to JFrame
setSize(550,200);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
} public static void main(String[] args) {
new CalFrame();
}
}
//怎么实现运算
//import java.util.*;
import javax.swing.*;//import java.awt.event.*;
public class CalFrame extends JFrame {
/**
*
*/
private static final long serialVersionUID = 833449942376457328L;
JPanel Main1, Main2,Main3;
JButton btncount, btnclean;
JLabel lbnnumber1, lbnnumber2, lbresult;
JTextField tetumber1, tetumber2, tetresult;
JRadioButton rbj, rbji, rbche, rbchu;
public CalFrame() {
super("简易计算器");
lbnnumber1 = new JLabel("第一个数");
lbnnumber2 = new JLabel("第二个数");
lbresult = new JLabel("结 果");
tetumber1 = new JTextField(10);
tetumber2 = new JTextField(10);
tetresult = new JTextField(10);
rbj = new JRadioButton("+");
//rbj.setSelected(true);
rbji = new JRadioButton("-");
rbche = new JRadioButton("*");
rbchu = new JRadioButton("/");
btncount = new JButton("计算");
btnclean = new JButton("清除");
Main1 = new JPanel();
Main1.setLayout(new GridLayout(3, 2));
Main2 = new JPanel();
Main3 = new JPanel();
Main1.add(lbnnumber1);
Main1.add(tetumber1);
Main1.add(lbnnumber2);
Main1.add(tetumber2);
Main1.add(lbresult);
Main1.add(tetresult);
Main2.add(rbj);
Main2.add(rbji);
Main2.add(rbche);
Main2.add(rbchu);
Main2.add(btncount);
Main2.add(btnclean);
Main3.add(Main1);
Main3.add(Main2);
// ((RootPaneContainer) Main3).setContentPane(Main3);*/
this.add(Main3); //Add panel to JFrame
setSize(550,200);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
} public static void main(String[] args) {
new CalFrame();
}
}
//怎么实现运算
btncount.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
double n1 = Double.parseDouble(tetumber1.getText());
double n2 = Double.parseDouble(tetumber2.getText());
if (rbj.isSelected()) {
tetresult.setText(Double.toString(n1 + n2));
} else if (rbji.isSelected()) {
tetresult.setText(Double.toString(n1 - n2));
} else if (rbche.isSelected()) {
tetresult.setText(Double.toString(n1 * n2));
} else if (rbchu.isSelected()) {
tetresult.setText(Double.toString(n1 / n2));
}
}
});
btnclean = new JButton("清除");
btnclean.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
tetumber1.setText("");
tetumber2.setText("");
tetresult.setText("");
rbji.setSelected(false);
rbche.setSelected(false);
rbchu.setSelected(false);
btncount.setSelected(false);
}
});
import java.awt.*; //import java.util.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.*;//import java.awt.event.*;
public class CalFrame extends JFrame implements ActionListener {
/**
*
*/
private static final long serialVersionUID = 833449942376457328L;
JPanel Main1, Main2, Main3;
JButton btncount, btnclean;
JLabel lbnnumber1, lbnnumber2, lbresult;
JTextField tetumber1, tetumber2, tetresult;
JRadioButton rbj, rbji, rbche, rbchu;
ButtonGroup bg; public CalFrame() {
super("简易计算器");
lbnnumber1 = new JLabel("第一个数");
lbnnumber2 = new JLabel("第二个数");
lbresult = new JLabel("结果");
tetumber1 = new JTextField(10);
tetumber2 = new JTextField(10);
tetresult = new JTextField(10);
tetresult.setEditable(false);//结果只能读
rbj = new JRadioButton("+");
rbj.setSelected(true);
rbji = new JRadioButton("-");
rbche = new JRadioButton("*");
rbchu = new JRadioButton("/");
btncount = new JButton("计算");
btncount.addActionListener(this);//添加指定的动作侦听器
btnclean = new JButton("清除");
btnclean.addActionListener(this);//添加指定的动作侦听器
Main1 = new JPanel();
Main1.setLayout(new GridLayout(3, 2));
Main2 = new JPanel();
Main3 = new JPanel();
//只能选中一个
bg = new ButtonGroup();
bg.add(rbj);
bg.add(rbji);
bg.add(rbche);
bg.add(rbchu);
Main1.add(lbnnumber1);
Main1.add(tetumber1);
Main1.add(lbnnumber2);
Main1.add(tetumber2);
Main1.add(lbresult);
Main1.add(tetresult);
Main2.add(rbj);
Main2.add(rbji);
Main2.add(rbche);
Main2.add(rbchu);
Main2.add(btncount);
Main2.add(btnclean);
Main3.add(Main1);
Main3.add(Main2);
// ((RootPaneContainer) Main3).setContentPane(Main3);*/
this.add(Main3); // Add panel to JFrame
setSize(550, 200);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
} public static void main(String[] args) {
new CalFrame();
} //处理事件
public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("计算")) {
if(rbj.isSelected()) {
calc('+');
} else if(rbji.isSelected()) {
calc('-');
} else if(rbche.isSelected()) {
calc('*');
} else if(rbchu.isSelected()) {
calc('/');
}
} else if(e.getActionCommand().equals("清除")) {
tetumber1.setText("");
tetumber2.setText("");
tetresult.setText("");
}
}
//计算
private void calc(char operator) {
double temp;
switch(operator) {
case '+':
temp = Double.parseDouble(tetumber1.getText()) + Double.parseDouble(tetumber2.getText());
tetresult.setText(Double.toString(temp));
break;
case '-':
temp = Double.parseDouble(tetumber1.getText()) - Double.parseDouble(tetumber2.getText());
tetresult.setText(Double.toString(temp));
break;
case '*':
temp = Double.parseDouble(tetumber1.getText()) * Double.parseDouble(tetumber2.getText());
tetresult.setText(Double.toString(temp));
break;
case '/':
if(Double.parseDouble(tetumber2.getText()) != 0) {
temp = Double.parseDouble(tetumber1.getText()) / Double.parseDouble(tetumber2.getText());
tetresult.setText(Double.toString(temp));
} else {
tetresult.setText("除数不能为零");
}
break;
}
}
}