英文:
Making the background of a JFrame window white by commenting out the data in the paint method
问题
我正在练习创建一个JFrame窗口，并遇到了一个问题。我观看的教程视频说要注释掉paint方法中给定的数据，以使窗口的背景变为白色而不是灰色。当我这样做时，窗口变成了透明的，并且捕捉了您计算机上显示的任何内容，并将其设置为窗口的背景。该视频是在2012年发布的，因此我认为Eclipse已经有一些进展引起了这个问题。那么，我如何将JFrame窗口的背景颜色更改为白色呢？
英文:
I was practicing making a JFrame window and stumbled upon an issue. The tutorial video i was watching said to comment out the data given in the paint method in order to make the background of the window, white insdead of grey. When I did that, the window turned transparent and it captured whatever was displayed on your computer and set it as the window's background. The vided was posted in 2012 so, i believe that there have been some advancements in Eclipse that caused the problem. So, how can i change the background colour of a JFrame window to white?
答案1
得分: 2
以下是您要翻译的内容：
So, how can i change the background colour of a JFrame window to white?
首先，通过更改contentPane的backgroundColor来开始，例如
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.getContentPane().setBackground(Color.WHITE);
frame.setSize(200, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
注意：我将其更改为白色以说明观点...
但这种方法有限，因为除非您更改布局管理器，否则一旦向其添加组件，它们将被覆盖。
一个“更好”的解决方案可能是创建一个组件，更改其backgroundColor并将其添加到窗口
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setBackground(Color.WHITE);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}
或者甚至将其作为contentPane，根据您的需要。
i believe that there have been some advancements in Eclipse that caused the problem
Eclipse与此无关。问题可能是由于对JRE或操作系统进行的更改引起的。
said to comment out the data given in the paint method
好的，绘制是一个复杂的过程，有许多重要的步骤，除非您清楚了解这些步骤并愿意接管并完成它们的工作，否则不要随意更改它 
英文:
> So, how can i change the background colour of a JFrame window to white?
Start by changing the backgroundColor of the contentPane, for example
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.getContentPane().setBackground(Color.RED);
frame.setSize(200, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
*nb I made it red to make the point...
This is limiting though, because, unless you change the layout manager, the moment you add a component to it, it will be covered.
A "better" solution might be to make a component and change it's backgroundColor and add it to the frame
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setBackground(Color.RED);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}
or even make it the contentPane, what ever you need.
> i believe that there have been some advancements in Eclipse that caused the problem
Eclipse has nothing to do with it. Will either be changes made to the JRE or OS
> said to comment out the data given in the paint method
Okay, painting is complicated process, with a number of important steps, unless you have a clear understanding of what those steps are AND are willing to take over from them and do their jobs, don't mess with it
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