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我正在嘗試使用Java創建Calculator應用程序。現在我正在用所有按鈕和麪板創建窗口來顯示點擊的數字。 不知怎的,我添加到框架的面板不顯示。任何人都可以幫助我。我在做什麼錯誤?Panel在Java框架中不可見
package com.wells.eda;
import java.awt.*;
public class Calc {
public static void main(String[] args) {
Calculator c = new Calculator();
try{
Frame fm= c.NewFrame("Calculator",330,310);
c.NewButton(fm, "1",10,110);
c.NewButton(fm, "2",90,110);
c.NewButton(fm, "3",170,110);
c.NewButton(fm, "4",10,160);
c.NewButton(fm, "5",90,160);
c.NewButton(fm, "6",170,160);
c.NewButton(fm, "7",10,210);
c.NewButton(fm, "8",90,210);
c.NewButton(fm, "9",170,210);
c.NewButton(fm, "00",10,260);
c.NewButton(fm, "0",90,260);
c.NewButton(fm, "Reserved",170,260);
c.NewButton(fm, "+",250,110);
c.NewButton(fm, "-",250,160);
c.NewButton(fm, "*",250,210);
c.NewButton(fm, "/",250,260);
c.NewPanel(fm);
//Thread.sleep(3000);
//fm.dispose();
}
catch(Exception e)
{
System.out.println("Exception happened");
}
}
}
class Calculator{
public Frame NewFrame(String name,int length, int width)
{
Frame fm = new Frame(name);
fm.setLayout(null);
fm.setResizable(false);
fm.setSize(length,width);
fm.setVisible(true);
return(fm);
}
public void NewButton(Frame fm,String number,int xcordinate,int ycordinate) throws Exception
{
Button b = new Button (number);
b.setBounds(xcordinate,ycordinate,70,40);
//b.setVisible(true);
fm.add(b);
}
public void NewPanel(Frame fm)
{
Panel p= new Panel(null);
fm.add(p);
//p.setSize(100, 100);
p.setBounds(10,10,250,100);
p.setName("Panel");
p.setVisible(true);
}
}
我不能將它添加到現有的框架沒有佈局?我還沒有意識到佈局。 –
佈局用於說明組件將如何放置。您應該每次都使用它,例如,如果您查看GridLayout或FlowLayout,這不是很難。 – MedAl
我的不好。我只是理解你設置一個空佈局,以便將這些組件放置在它們的座標上。那麼唯一的問題是:你的面板是空的。您將按鈕添加到框架,而不是面板 – MedAl