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📜  Java Swing-JButton

📅  最后修改于: 2020-09-29 09:58:47             🧑  作者: Mango

Java JButton

JButton类用于创建具有平台独立实现的带标签的按钮。按下按钮后，应用程序将执行某些操作。它继承了AbstractButton类。

JButton类声明

我们来看一下javax.swing.JButton类的声明。

public class JButton extends AbstractButton implements Accessible

常用的构造函数：

Constructor Description
JButton() It creates a button with no text and icon.
JButton(String s) It creates a button with the specified text.
JButton(Icon i) It creates a button with the specified icon object.

常用的AbstractButton类方法：

Methods Description
void setText(String s) It is used to set specified text on button
String getText() It is used to return the text of the button.
void setEnabled(boolean b) It is used to enable or disable the button.
void setIcon(Icon b) It is used to set the specified Icon on the button.
Icon getIcon() It is used to get the Icon of the button.
void setMnemonic(int a) It is used to set the mnemonic on the button.
void addActionListener(ActionListener a) It is used to add the action listener to this object.

Java JButton示例

import javax.swing.*;  
public class ButtonExample {
public static void main(String[] args) {
JFrame f=new JFrame("Button Example");
JButton b=new JButton("Click Here");
b.setBounds(50,100,95,30);
f.add(b);
f.setSize(400,400);
f.setLayout(null);
f.setVisible(true);
}
}

输出：

带有ActionListener的Java JButton示例

import java.awt.event.*;
import javax.swing.*;  
public class ButtonExample {
public static void main(String[] args) {
JFrame f=new JFrame("Button Example");
final JTextField tf=new JTextField();
tf.setBounds(50,50, 150,20);
JButton b=new JButton("Click Here");
b.setBounds(50,100,95,30);
b.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
            tf.setText("Welcome to Javatpoint.");
}
});
f.add(b);f.add(tf);
f.setSize(400,400);
f.setLayout(null);
f.setVisible(true);
}
}

输出：

在按钮上显示图像的示例：

import javax.swing.*;    
public class ButtonExample{  
ButtonExample(){  
JFrame f=new JFrame("Button Example");          
JButton b=new JButton(new ImageIcon("D:\\icon.png"));  
b.setBounds(100,100,100, 40);  
f.add(b);  
f.setSize(300,400);  
f.setLayout(null);  
f.setVisible(true);  
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
    }       
public static void main(String[] args) {  
    new ButtonExample();  
}  
}

输出：