importjavax.swing.*;importjava.awt.*;publicclassHelloAWT{publicstaticvoidmain(String[]args){// Frame 默认的布局管理器就是 BorderLayoutFrame frame=newFrame("AWT 界面编程");Box box=Box.createVerticalBox();frame.add(box);// 多行文本TextArea textArea=newTextArea(5,30);textArea.setText("多行...
Provides classes and interfaces for dealing with javax.swing.JTree. Uses of Component in java.applet Subclasses of Component in java.applet Modifier and TypeClass and Description class Applet An applet is a small program that is intended not to be run on its own, but rather to be embedded...
Component add(Component c) : 向Container 容器 中 添加 Component 组件 实例对象 , 返回被添加的组件 ; 注意 Container 是 Component 的子类 , 因此 此处也可以添加 Container 容器 ; Component getComponentAt(int x, int y) : 返回指定 屏幕坐标 位置的组件 ; int getComponentCount() : 获取Container 容器...
import java.awt.Frame; import java.awt.Panel; public class PanelInFrame extends Frame{ public static void main(String[] args) { // TODO Auto-generated method stub PanelInFrame fr = new PanelInFrame("Frame with Panel"); Panel pan = new Panel(); fr.setSize(250, 250); fr.setBackgroun...
java.awt.Component.AccessibleAWTComponent Packages that useComponent.AccessibleAWTComponent PackageDescription java.applet Provides the classes necessary to create an applet and the classes an applet uses to communicate with its applet context. java.awt ...
GraalVM includes java.awt.Component and derived classes into native image even a Java Beans application does not use them. Steps to reproduce: Compile the BeanSample.java class which does not defi...
As a subclass of Component, each child inherits a common set of methods and an API for dealing with the different events (i.e., mouse click, keyboard input) that occur within your Java programs.After discussing the methods in Component classes, this chapter goes into detail about two ...
The new names obey the naming conventions used by JavaBeans, which means that all AWT classes are potentially Beans. These conventions make it possi- ble for an application builder to analyze what a component does based on its pub- lic methods. For example, the method setFont() changes the...
Exception in thread main java.awt.IllegalComponentStateException contentPane cannot be set to null. 本文总字数:696,阅读预计需要:2分钟 问题描述# 使用IDEA创建Swing布局文件和绑定Class后无法运行,报错信息如下: Copy Exceptioninthread"main"java.awt.IllegalComponentStateException: contentPane cannot besetto ...
把窗体设置透明度的前提需要先取出窗体的标题栏，才合法，即this.setUndecorated(true);否则你需要去掉setOpacity this