What is JFrame in java

In java, JFrame is an officially provided class. The main function of this class is to use this class to quickly develop Java interface applications (c/s architecture), which belongs to the java.swing knowledge system; It is the object of the window on the screen and can be maximized, minimized, and closed.

JFrame refers to a computer language-java GUI program. The basic idea is based on JFrame. It is the object of the window on the screen and can maximize, Minimize, close.

Basic Blocks

Swing has three basic building blocks: labels, buttons, and text fields; but you need a place to put them, and you want users to know how to deal with them.

The JFrame class solves this problem - it is a container that allows programmers to add other components to it, organize them, and present them to the user. JFrame actually does more than just allow programmers to put components into it and present them to the user. Despite its apparent simplicity, it is actually the most complex component in the Swing package. To maximize component simplicity, JFrame acts as a bridge between operating system-independent Swing components and the operating system that actually runs them. JFrame is registered as a window with the native operating system, and by doing so, you get many of the familiar operating system window features: minimize/maximize, resize, and move.

JFrame is a top-level frame class, like a window frame. It is also a container class. This frame can accommodate several glass windows.

Construction method of JFrame:

JFrame()
构造一个初始时不可见的新窗体。
JFrame(GraphicsConfiguration gc)
以屏幕设备的指定 GraphicsConfiguration 和空白标题创建一个 Frame。
JFrame(String title)
创建一个新的、初始不可见的、具有指定标题的 Frame。
JFrame(String title, GraphicsConfiguration gc)
创建一个具有指定标题和指定屏幕设备的 GraphicsConfiguration 的 JFrame。

I found a significant feature of using Java to make windows is that there is no unique way to implement the window function. In other words, there are many.

First make a JFrame Hello, world

package window;

import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JLabel;

public class JFrameWindow extends JFrame{     //需要继承JFrame

    public JFrameWindow(String title)
    {
        JFrame jf = new JFrame(title);    
        Container conn = jf.getContentPane();    //得到窗口的容器
        JLabel L1 = new JLabel("Hello,world!");    //创建一个标签 并设置初始内容
        
        conn.add(L1);
        
        jf.setBounds(200,200,300,200); //设置窗口的属性 窗口位置以及窗口的大小
        jf.setVisible(true);//设置窗口可见
        jf.setDefaultCloseOperation(DISPOSE_ON_CLOSE); //设置关闭方式 如果不设置的话 似乎关闭窗口之后不会退出程序
    }
    
    public static void main(String[] args) {
        new JFrameWindow("窗口");        //创建窗口
    }

}

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