java awt_Java AWT框架

浅浅的花香味﹌ 2023-03-05 06:29 142阅读 0赞

java awt

**Creating a frame** is one of the most elementary steps in designing any GUI application. Almost in all cases we will place components in a frame. There are two ways to create a frame.

**创建框架**是设计任何GUI应用程序中最基本的步骤之一。 几乎在所有情况下，我们都将组件放置在框架中。 有两种创建框架的方法。

1.  Extend the frame class
    
    扩展框架类
2.  Make a frame object
    
    制作框架对象

There are some methods associated with a frame class that are used to set its properties.

与框架类相关联的一些方法可用于设置其属性。

1.  **public void setLayout(LayoutManager lm)** – It is used to set the layout that a frame uses. A layout basically dictates the position of various components that are placed in it.
    
    **public void setLayout(LayoutManager lm)** –用于设置框架使用的布局。 布局基本上指示放置在其中的各种组件的位置。
2.  **public void setSize(int width, int height)** – It is used to set the intial size of the frame.
    
    **public void setSize(int width，int height)** –用于设置框架的初始尺寸。
3.  **public void setVisible(boolean visibility)** – It is used to set the visibility of the frame. It must be set to true for the frame (and the various components placed in it) to be visible on the screen.
    
    **public void setVisible(boolean visible)** \-用于设置框架的可见性。 必须将其设置为true，以使框架(及其中放置的各种组件)在屏幕上可见。
4.  **public void add (Component c)** – It is used to place/add the components in the frame.
    
    **public void add(组件c)** –用于在框架中放置/添加组件。

Let us see how to use these various methods. We design a simple frame and place a button and a label on the screen.

让我们看看如何使用这些各种方法。 我们设计一个简单的框架，然后在屏幕上放置一个按钮和一个标签。

**1. Extend the Frame class**

**1.扩展框架类**

Consider the following code -

考虑以下代码-

import java.awt.*;
    
    public class CreateFrame extends Frame {
        
        CreateFrame() {
        
            Button b1 = new Button("Click me!");
            Label l1 = new Label("Label");
    
            b1.setBounds(50, 50, 100, 50);
            l1.setBounds(50, 100, 100, 50);
    
            setLayout(null);
            setSize(300, 300);
            setVisible(true);
    
            add(b1);
            add(l1);
        }
    
        public static void main(String[] args) {
        
            CreateFrame f = new CreateFrame();
        }
    }

In this code, the **CreateFrame class** extends the **Frame class**. So we dont need to explicitly make an object of frame class. Methods like *add()* and *setVisible()* are automatically called on the **CreateFrame class**.

在此代码中， **CreateFrame类**扩展了**Frame类** 。 因此，我们无需显式创建框架类的对象。 诸如*add()*和*setVisible()*之**类的方法会**在**CreateFrame类**上自动调用。

**2. Make an object of Frame class**

**2.制作一个Frame类的对象**

Consider the following code -

考虑以下代码-

import java.awt.*;
    
    public class CreateFrame {
        
        public static void main(String[] args) {
        
            Frame f = new Frame();
            Button b1 = new Button("Click me!");
            Label l1 = new Label("Label");
    
            b1.setBounds(50, 50, 100, 50);
            l1.setBounds(50, 100, 100, 50);
    
            f.setLayout(null);
            f.setSize(300, 300);
            f.setVisible(true);
    
            f.add(b1);
            f.add(l1);
        }
    }

In this code, we explicitly create an object of the Frame class and all methods are called on this object.

在此代码中，我们显式创建一个Frame类的对象，并在该对象上调用所有方法。

**Output**: In both cases, we get the same output

**输出** ：在两种情况下，我们得到相同的输出

![Java AWT Frame][]

> 翻译自: [https://www.includehelp.com/java/awt-frame.aspx][https_www.includehelp.com_java_awt-frame.aspx]

java awt

[Java AWT Frame]: https://www.includehelp.com/java/Images/awt-frame.jpg
[https_www.includehelp.com_java_awt-frame.aspx]: https://www.includehelp.com/java/awt-frame.aspx