import java.awt.*;
import java.awt.event.*;import javax.naming.spi.DirStateFactory.Result;
import javax.swing.*;public class oneandtwo {
public static void main(String args[]) {
frame f = new frame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.show();
f.setResizable(false);
}
}class frame extends JFrame {
TextField num1, num2;
int sum;
String s;
public frame() {
setTitle("加法");
setSize(220, 50);
setBounds(300, 300, 220, 50);
JTextField num1 = new JTextField(10);
JTextField num2 = new JTextField(10);
JTextField num3 = new JTextField(10);
JLabel plus = new JLabel("+");
JButton equal = new JButton("=");
JPanel jpanel = new JPanel();
jpanel.setLayout(new GridLayout(1, 5));
jpanel.add(num1);
jpanel.add(plus);
jpanel.add(num2);
jpanel.add(equal);
jpanel.add(num3);
Container c = getContentPane();
c.add(jpanel);
equal.addActionListener(new action1());
} class action1 implements ActionListener {
public void actionPerformed(ActionEvent e) {
int n1 = Integer.parseInt(num1.getText().trim());
int n2 = Integer.parseInt(num2.getText().trim());
sum= n1 + n2;
s = new String("" + sum);
num3.setText(s);
}
}}
import java.awt.event.*;import javax.naming.spi.DirStateFactory.Result;
import javax.swing.*;public class oneandtwo {
public static void main(String args[]) {
frame f = new frame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.show();
f.setResizable(false);
}
}class frame extends JFrame {
TextField num1, num2;
int sum;
String s;
public frame() {
setTitle("加法");
setSize(220, 50);
setBounds(300, 300, 220, 50);
JTextField num1 = new JTextField(10);
JTextField num2 = new JTextField(10);
JTextField num3 = new JTextField(10);
JLabel plus = new JLabel("+");
JButton equal = new JButton("=");
JPanel jpanel = new JPanel();
jpanel.setLayout(new GridLayout(1, 5));
jpanel.add(num1);
jpanel.add(plus);
jpanel.add(num2);
jpanel.add(equal);
jpanel.add(num3);
Container c = getContentPane();
c.add(jpanel);
equal.addActionListener(new action1());
} class action1 implements ActionListener {
public void actionPerformed(ActionEvent e) {
int n1 = Integer.parseInt(num1.getText().trim());
int n2 = Integer.parseInt(num2.getText().trim());
sum= n1 + n2;
s = new String("" + sum);
num3.setText(s);
}
}}
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.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;public class Oneandtwo {
public static void main(String args[]) {
frame f = new frame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true); // .show 改为这个
f.setResizable(false);
}
}class frame extends JFrame {
JTextField num1, num2, num3; // 声明3个JTextField int sum; String s; public frame() {
setTitle("加法");
setSize(220, 50);
setBounds(300, 300, 220, 50);
num1 = new JTextField(10); // 这三个就不要再声明了,否则后面的class里面拿不到
num2 = new JTextField(10);
num3 = new JTextField(10);
JLabel plus = new JLabel("+");
JButton equal = new JButton("=");
JPanel jpanel = new JPanel();
jpanel.setLayout(new GridLayout(1, 5));
jpanel.add(num1);
jpanel.add(plus);
jpanel.add(num2);
jpanel.add(equal);
jpanel.add(num3);
Container c = getContentPane();
c.add(jpanel);
equal.addActionListener(new action1());
} class action1 implements ActionListener {
public void actionPerformed(ActionEvent e) {
int n1 = Integer.parseInt(num1.getText().trim());
int n2 = Integer.parseInt(num2.getText().trim());
sum = n1 + n2;
s = new String("" + sum);
num3.setText(s);
}
}}
import java.awt.event.*; import javax.naming.spi.DirStateFactory.Result;
import javax.swing.*; public class Oneandtwo {
public static void main(String args[]) {
Frame f = new Frame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.show();
f.setResizable(false);
}
}class Frame extends JFrame {
JTextField num1,num2,num3; int sum; String s; public Frame() {
setTitle("加法");
setSize(220, 50);
setBounds(300, 300, 220, 50);
num1 = new JTextField(10);
num2 = new JTextField(10);
num3 = new JTextField(10);
JLabel plus = new JLabel("+");
JButton equal = new JButton("=");
JPanel jpanel = new JPanel();
jpanel.setLayout(new GridLayout(1, 5));
jpanel.add(num1);
jpanel.add(plus);
jpanel.add(num2);
jpanel.add(equal);
jpanel.add(num3);
Container c = getContentPane();
c.add(jpanel);
equal.addActionListener(new Action1());
} class Action1 implements ActionListener {
public void actionPerformed(ActionEvent e) {
int n1 = Integer.parseInt(num1.getText().trim());
int n2 = Integer.parseInt(num2.getText().trim());
sum = n1 + n2;
s = new String("" + sum);
num3.setText(s);
}
}}
不过楼上的import那么多包好像没有必要哦~
还是感谢感谢呀~
String s =" " + "sss" + " ";
你用s.trim()后就把前面和后面的空格去掉了。