java为什么将组件添加到JPanel中时，可以显示面板，但当组件首先添加到框架中时，无法显示面板
我想让用户一次选择一首歌曲，与渲染的移动乐谱一起播放。我希望用户可以选择一首歌曲，然后点击“播放”按钮开始播放。因此，我想在JFrame中放置一个JComboBox，每次用户选择一首歌时，我都可以为移动乐谱呈现一个相应的JPanel。但是，当我把组合框和其他组件放入一个框架中时，面板无法显示
将这些组件放入面板的代码如下所示：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import java.io.*;
import sun.audio.*;
import java.io.IOException;
class MyPanel extends JPanel{
public int x[] = new int[59];
public int y[] = new int[59];
public int width[] = new int[59];
public int height = 20;
Color color[] = new Color[59];//the color of each note
String[] lyric = {"一", " 根", "紫～", "竹", "直～", "苗～", "苗,", "送", "給", "寶", "寶", "做", "管", "簫,",
"簫", "兒", "對", "準", "口,", "口", "兒", "對", "準", "簫,",
"簫～", "中", "吹～", "出", "新～", "時～ ", "調,",
"小", "寶～", "寶,", "小", "寶～", "寶,",
"咿", "底", "咿", "底", "學 ", "會", "了,", "啊 ～ ～ ～"};//共45個
int[] numNotes = {1, 1, 2, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 1, 2, 1, 2, 2, 1,
1, 2, 1, 1, 2, 1,
1, 1, 1, 1, 1, 1, 1, 6};//共45個
int[][] notes = {{5,2},{8,2},{6,1},{5,1},{3,2},{5,1},{2,1},{3,1},{2,1},{1,4},{6,1},{8,1},
{3,1},{5,1},{6,2},{3,2},{5,8},{8,1},{6,1},{3,1},{6,1},{5,4},{6,1},{8,1},
{3,1},{6,1},{5,4},{5,1},{6,1},{8,2},{6,1},{5,1},{3,2},{5,1},{2,1},{3,1},
{2,1},{1,4},{1,2},{1,1},{3,1},{2,4},{1,2},{1,1},{3,1},{2,4},{6,1},{8,1},
{6,1},{8,1},{9,2},{6,2},{5,3},{6,1},{2,1},{3,1},{5,1},{6,1},{5,8}};//共59個
String[] simplifiedNote = {"| 5", " 1", " 6", "5", "3", "| 5", "2", "3", "2", "1 - ", "| 6", "1",
"3", "5", "6", " 3", " 5 - - -", "| 1", "6", "3", "6", "5 - ", "| 6", "1",
"3", "6", "5 -", "| 5", "6", "1", "6", "5", " 3", "| 5", "2", "3",
"2", "1 -", "| 1", "1", "3", "2 -", "| 1", "1", "3", "2 -", "| 6", "1",
"6", "1", "2", "6", "| 5 .", "6", "2", "3", "5", "6", "| 5 - - - "};//共59個
Color color0 = new Color(255,255,255); //白色
Color color1 = new Color(255,0,0); //紅色
Color color2 = new Color(255,165,0); //橙色
Color color3 = new Color(255,255,0); //黃色
Color color4 = new Color(0,128,0); //綠色
Color color5 = new Color(0,0,255); //藍色
Color color6 = new Color(75,0,130); //靛色
Color color7 = new Color(100,0,153); //紫色
Color color8 = new Color(153,0,0); //暗紅
Color color9 = new Color(0,0,0); //黑色
public void display(){
for (int i = 0;i < notes.length; i++) {
//System.out.println("notes[" + i + "][0] = " + notes[i][0]);
switch (notes[i][0]) {
case 1:
y[i] = 400;
color[i] = color1;
break;
case 2:
y[i] = 400 - 20;
color[i] = color2;
break;
case 3:
y[i] = 400 - 20*2;
color[i] = color3;
break;
case 4:
y[i] = 400 - 20*3;
color[i] = color4;
break;
case 5:
y[i] = 400 - 20*4;
color[i] = color5;
break;
case 6:
y[i] = 400 - 20*5;
color[i] = color6;
break;
case 7:
y[i] = 400 - 20*6;
color[i] = color7;
break;
case 8:
y[i] = 400 - 20*7;
color[i] = color1;
break;
case 9:
y[i] = 400 - 20*8;
color[i] = color2;
}
switch (notes[i][1]) {
case 1: width[i] = 20;
break;
case 2: width[i] = 20 * 2;
break;
case 3: width[i] = 20 * 3;
break;
case 4: width[i] = 20 * 4;
break;
case 5: width[i] = 20 * 5;
break;
case 6: width[i] = 20 * 6;
break;
case 7: width[i] = 20 * 7;
break;
case 8: width[i] = 20 * 8;
}
}
x[0] = 100;
for (int i = 1; i < notes.length; i++){
x[i] = x[i-1] + width[i-1];
}
int timeLast = 0;
//timeLast = total executing time
while(timeLast < 900){
for (int i = 0; i < notes.length; i ++){
x[i]--;
}
this.repaint();
try {Thread.sleep(155);}
catch (InterruptedException e){
e.printStackTrace();
}
timeLast = timeLast + 1;
}
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.setFont(new Font("新細明體", Font.BOLD, 20));
int y1 = 130; //C調 4/4 Y坐標
int y2 = 180; //簡譜行Y坐標
int y3 = 210; //歌詞行Y坐標
int y4 = 163; //加高音點
int y5 = 180; //加八分音符底線
int y6 = 470; //色彩音符說明
int chrPosition = 0;
g2d.drawString("C調 4/4", 16, y1);
//繪出最底下的色彩音符說明
g2d.drawString("色彩音符說明：", 16, y6);
g2d.setColor(color1);
g2d.fillRoundRect(176, y6-16, 20,20, 3,3);
g2d.setColor(color9);
g2d.drawString(": Do", 200, y6);
g2d.setColor(color2);
g2d.fillRoundRect(256, y6-16, 20,20, 3,3);//220 + 56
g2d.setColor(color9);
g2d.drawString(": Re", 280, y6);
g2d.setColor(color3);
g2d.fillRoundRect(336, y6-16, 20,20, 3,3);//230 + 56
g2d.setColor(color9);
g2d.drawString(": Mi", 360, y6);
g2d.setColor(color4);
g2d.fillRoundRect(416, y6-16, 20,20, 3,3);//322 + 56
g2d.setColor(color9);
g2d.drawString(": Fa", 440, y6);//366 + 24
g2d.setColor(color5);
g2d.fillRoundRect(496, y6-16, 20,20, 3,3);//390 + 56
g2d.setColor(color9);
g2d.drawString(": So", 520, y6);//446 + 24
g2d.setColor(color6);
g2d.fillRoundRect(576, y6-16, 20,20, 3,3);//470 + 56
g2d.setColor(color9);
g2d.drawString(": La", 600, y6);
//寫出簡譜
for (int i = 0;i < simplifiedNote.length; i++){
g2d.drawString(simplifiedNote[i], x[i], y2);
}
//在簡譜下方寫出歌詞
g2d.setColor(color9);
for (int i = 0; i < lyric.length; i++){
if (i != 0 && numNotes[i-1] == 2) {
chrPosition = chrPosition + 1;
g2d.drawString(lyric[i], x[chrPosition], y3);
}
else {
g2d.drawString(lyric[i], x[chrPosition], y3);
}
chrPosition = chrPosition + 1;
}
//在簡譜上方加高音點
g2d.setColor(color9);
g2d.drawString(".", x[1]+14, y4);
g2d.drawString(".", x[11]+2, y4);
g2d.drawString(".", x[17]+11, y4);
g2d.drawString(".", x[23]+2, y4);
g2d.drawString(".", x[29]+2, y4);
g2d.drawString(".", x[47]+2, y4);
g2d.drawString(".", x[49]+2, y4);
g2d.drawString(".", x[50]+2, y4);
//在簡譜下方加八分音符底線
g2d.setColor(color9);
g2d.drawString("_", x[2]+4, y5);
g2d.drawString("_", x[3], y5);
g2d.drawString("_", x[5]+8, y5);
g2d.drawString("_", x[6], y5);
g2d.drawString("_", x[7], y5);//5
g2d.drawString("_", x[8], y5);
g2d.drawString("_", x[10]+8, y5);
g2d.drawString("_", x[11], y5);
g2d.drawString("_", x[12], y5);
g2d.drawString("_", x[13], y5);//10
g2d.drawString("_", x[17]+8, y5);
g2d.drawString("_", x[18], y5);
g2d.drawString("_", x[19], y5);
g2d.drawString("_", x[20], y5);
g2d.drawString("_", x[22]+8, y5);//15
g2d.drawString("_", x[23], y5);
g2d.drawString("_", x[24], y5);
g2d.drawString("_", x[25], y5);
g2d.drawString("_", x[27]+8, y5);
g2d.drawString("_", x[28], y5);//20
g2d.drawString("_", x[30], y5);
g2d.drawString("_", x[31], y5);
g2d.drawString("_", x[33]+8, y5);
g2d.drawString("_", x[34], y5);
g2d.drawString("_", x[35], y5);
g2d.drawString("_", x[36], y5);//25
g2d.drawString("_", x[39], y5);
g2d.drawString("_", x[40], y5);
g2d.drawString("_", x[43], y5);//1
g2d.drawString("_", x[44], y5);//3
g2d.drawString("_", x[46]+8, y5);//6
g2d.drawString("_", x[47], y5);//1
g2d.drawString("_", x[48], y5);//6
g2d.drawString("_", x[49], y5);//1
g2d.drawString("_", x[53], y5);//6
g2d.drawString("_", x[54], y5);//2
g2d.drawString("_", x[55], y5);//3
g2d.drawString("_", x[56], y5);//5
g2d.drawString("_", x[57], y5);//6
//在歌詞下方繪出彩色譜
for (int i = 0;i < notes.length; i++){
g2d.setColor(color[i]);
g2d.fillRoundRect(x[i], y[i], width[i], height, 3,3); //畫圓角方塊
g2d.setColor(color8);
g2d.drawLine(x[i],230, x[i]+width[i], 230);//畫水平上線
g2d.setColor(color8);
g2d.drawLine(x[i],231, x[i], 429);//畫直紅線
g2d.setColor(color8);
g2d.drawLine(x[i],430, x[i]+width[i], 430);//畫水平下線
}
g2d.setColor(color8);
g2d.drawLine(x[notes.length-1]+ width[notes.length - 1],231, x[notes.length - 1] + width[notes.length - 1],429);//畫邊界直紅線
}
}
public class Test7 {
public static void main(String[] args) throws IOException
{
JFrame jf = new JFrame("康樂彩歌");
jf.setBounds(0, 0, 1368, 730);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MyPanel jp = new MyPanel();
//jp.setBackground(Color.lightGray);
jp.setBorder(BorderFactory.createLineBorder(Color.black));
JLabel label1 = new JLabel("選歌："); //創建標簽
label1.setFont(new Font("新細明體", Font.PLAIN, 20));
JComboBox cmbox = new JComboBox(); //創建JComboBox
cmbox.setFont(new Font("新細明體", Font.PLAIN, 20));
cmbox.addItem("紫竹調");
cmbox.addItem("走一同去郊遊");
cmbox.addItem("我家門前有小河");
JRadioButton rb1 = new JRadioButton("加人聲", false);
rb1.setFont(new Font("新細明體", Font.PLAIN, 20));
JButton btPlay = new JButton("PLAY");
btPlay.setFont(new Font(Font.DIALOG_INPUT, Font.BOLD, 25));
jp.add(label1);
jp.add(cmbox);
jp.add(rb1);
jp.add(btPlay);
jf.setVisible(true);
jf.add(jp);
jp.display();
}
}
下面列出了将这些组件放入框架中的代码：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import java.io.*;
import sun.audio.*;
import java.io.IOException;
class Panel1 extends JPanel{
public int x[] = new int[59];
public int y[] = new int[59];
public int width[] = new int[59];
public int height = 20;
Color color[] = new Color[59];//the color of each note
//一根紫 竹 直 苗 苗, 5 ? 65 3 │ 52 32 1 ─
//送給寶寶做管 簫, 6 ? 3 5 6 3 │5 ─ ─ ─
//簫兒對準口, ? 6 3 6 5 ─
//口兒對準簫, 6 5 3 6 5 ─
//簫 中吹 出 新 時 調, 56 ? 65 3 │ 52 32 1 ─
//小寶寶, 小寶 寶, 1 13 2 ─ | 1 13 2 ─
//咿底 咿底學會了.啊～～ 6 ? 6 ? 2 6 | 5 . 6 23 56│ 5 ─ ─ ─
String[] lyric = {" 一", " 根", "紫～", "竹", "直～", "苗～", "苗,",
"送", "給", "寶", "寶", "做", "管", " 簫,",
"簫", "兒", "對", "準", "口,", "口", "兒", "對", "準", "簫,",
"簫～", "中", "吹～", "出", "新～", "時～ ", "調,",
"小", "寶～", "寶,", "小", "寶～", "寶,",
"咿", "底", "咿", "底", " 學 ", "會", "了,", "啊 ～ ～ ～"};//共45個
int[] numNotes = {1, 1, 2, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 1, 2, 1, 2, 2, 1,
1, 2, 1, 1, 2, 1,
1, 1, 1, 1, 1, 1, 1, 6};//共45個
int[][] notes = {{5,2},{8,2},{6,1},{5,1},{3,2},{5,1},{2,1},{3,1},{2,1},{1,4},{6,1},{8,1},
{3,1},{5,1},{6,2},{3,2},{5,8},{8,1},{6,1},{3,1},{6,1},{5,4},{6,1},{5,1},
{3,1},{6,1},{5,4},{5,1},{6,1},{8,2},{6,1},{5,1},{3,2},{5,1},{2,1},{3,1},
{2,1},{1,4},{1,2},{1,1},{3,1},{2,4},{1,2},{1,1},{3,1},{2,4},{6,1},{8,1},
{6,1},{8,1},{9,2},{6,2},{5,3},{6,1},{2,1},{3,1},{5,1},{6,1},{5,8}};//共59個
String[] simplifiedNote = {" 5", " 1", " 6", "5", "3", " 5", " 2", " 3", "2", "1 - ",
" 6", " 1"," 3", " 5", " 6", " 3", " 5 - - -",
" 1", " 6", " 3", " 6", " 5 - ", " 6", " 5", " 3", " 6", " 5 -",
" 5", " 6", " 1", " 6", "5", " 3", " 5", "2", " 3"," 2", "1 -",
" 1", " 1", "3", "2 -", " 1", " 1", "3", "2 -",
" 6", "1","6", "1", " 2", "6", " 5 ．", "6",
" 2", "3", " 5", "6", " 5 - - - "};//共59個
Color color0 = new Color(255,255,255); //白色
Color color1 = new Color(255,0,0); //紅色
Color color2 = new Color(255,165,0); //橙色
Color color3 = new Color(255,255,0); //黃色
Color color4 = new Color(0,128,0); //綠色
Color color5 = new Color(0,0,255); //藍色
Color color6 = new Color(75,0,130); //靛色
Color color7 = new Color(100,0,153); //紫色
Color color8 = new Color(153,0,0); //暗紅
Color color9 = new Color(0,0,0); //黑色
//Constructor for initializing the color, y position, width, length of each note
Panel1(){
for (int i = 0;i < notes.length; i++) {
//System.out.println("notes[" + i + "][0] = " + notes[i][0]);
switch (notes[i][0]) {
case 1:
y[i] = 400;
color[i] = color1;
break;
case 2:
y[i] = 400 - 20;
color[i] = color2;
break;
case 3:
y[i] = 400 - 20*2;
color[i] = color3;
break;
case 4:
y[i] = 400 - 20*3;
color[i] = color4;
break;
case 5:
y[i] = 400 - 20*4;
color[i] = color5;
break;
case 6:
y[i] = 400 - 20*5;
color[i] = color6;
break;
case 7:
y[i] = 400 - 20*6;
color[i] = color7;
break;
case 8:
y[i] = 400 - 20*7;
color[i] = color1;
break;
case 9:
y[i] = 400 - 20*8;
color[i] = color2;
}
switch (notes[i][1]) {
case 1: width[i] = 20;
break;
case 2: width[i] = 20 * 2;
break;
case 3: width[i] = 20 * 3;
break;
case 4: width[i] = 20 * 4;
break;
case 5: width[i] = 20 * 5;
break;
case 6: width[i] = 20 * 6;
break;
case 7: width[i] = 20 * 7;
break;
case 8: width[i] = 20 * 8;
}
}
x[0] = 100;
for (int i = 1; i < notes.length; i++){
x[i] = x[i-1] + width[i-1];
}
}
public void display1(){
//*
int timeLast = 0;
//timeLast = total executing time
while(timeLast < 1000){
for (int i = 0; i < notes.length; i ++){
x[i]--;
}
this.repaint();
try {Thread.sleep(30);}
catch (InterruptedException e){
e.printStackTrace();
}
timeLast = timeLast + 1;
}
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.setFont(new Font("新細明體", Font.BOLD, 20));
int y1 = 130; //C調 4/4 Y坐標
int y2 = 180; //簡譜行Y坐標
int y3 = 210; //歌詞行Y坐標
int y4 = 163; //加高音點
int y5 = 180; //加八分音符底線
int y6 = 470; //色彩音符說明
int chrPosition = 0;
g2d.drawString("C調 4/4", 16, y1);
//繪出最底下的色彩音符說明
g2d.drawString("色彩音符說明：", 16, y6);
g2d.setColor(color1);
g2d.fillRoundRect(176, y6-16, 20,20, 3,3);
g2d.setColor(color9);
g2d.drawString(": Do", 200, y6);
g2d.setColor(color2);
g2d.fillRoundRect(256, y6-16, 20,20, 3,3);//220 + 56
g2d.setColor(color9);
g2d.drawString(": Re", 280, y6);
g2d.setColor(color3);
g2d.fillRoundRect(336, y6-16, 20,20, 3,3);//230 + 56
g2d.setColor(color9);
g2d.drawString(": Mi", 360, y6);
g2d.setColor(color4);
g2d.fillRoundRect(416, y6-16, 20,20, 3,3);//322 + 56
g2d.setColor(color9);
g2d.drawString(": Fa", 440, y6);//366 + 24
g2d.setColor(color5);
g2d.fillRoundRect(496, y6-16, 20,20, 3,3);//390 + 56
g2d.setColor(color9);
g2d.drawString(": So", 520, y6);//446 + 24
g2d.setColor(color6);
g2d.fillRoundRect(576, y6-16, 20,20, 3,3);//470 + 56
g2d.setColor(color9);
g2d.drawString(": La", 600, y6);
//在簡譜下方寫出歌詞
g2d.setColor(color9);
for (int i = 0; i < lyric.length; i++){
if (i != 0 && numNotes[i-1] == 2) {
chrPosition = chrPosition + 1;
g2d.drawString(lyric[i], x[chrPosition], y3);
}
else {
g2d.drawString(lyric[i], x[chrPosition], y3);
}
chrPosition = chrPosition + 1;
}
//在簡譜上方加高音點
g2d.setColor(color8);
g2d.drawString(".", x[1]+14, y4);
g2d.drawString(".", x[11]+8, y4);
g2d.drawString(".", x[17]+7, y4);
g2d.drawString(".", x[29]+8, y4);
g2d.drawString(".", x[47]+2, y4);
g2d.drawString(".", x[49]+2, y4);
g2d.drawString(".", x[50]+8, y4);
//*
//在簡譜下方加八分音符底線
g2d.setColor(color8);
g2d.drawLine(x[2]+5,y5+5,x[4]-10,y5+5);
g2d.drawLine(x[5]+10,y5+5,x[7]-5,y5+5);
g2d.drawLine(x[7]+3,y5+5,x[9]-8,y5+5);
g2d.drawLine(x[10]+10,y5+5,x[11],y5+5);
g2d.drawLine(x[11]+5,y5+5,x[12]-5,y5+5);
g2d.drawLine(x[12]+5,y5+5,x[13]-5,y5+5);
g2d.drawLine(x[13]+5,y5+5,x[14]-5,y5+5);
g2d.drawLine(x[17]+5,y5+4,x[18]-5,y5+4);
g2d.drawLine(x[18]+5,y5+4,x[19]-5,y5+4);
g2d.drawLine(x[19]+5,y5+4,x[20]-5,y5+4);
g2d.drawLine(x[20]+5,y5+4,x[21]-5,y5+4);
g2d.drawLine(x[22]+5,y5+5,x[23]-2,y5+5);
g2d.drawLine(x[23]+5,y5+5,x[24]-5,y5+5);
g2d.drawLine(x[24]+5,y5+5,x[25]-5,y5+5);
g2d.drawLine(x[25]+5,y5+5,x[26]-5,y5+5);
g2d.drawLine(x[27]+5,y5+5,x[29]-3,y5+5);
g2d.drawLine(x[30]+1,y5+5,x[32]-5,y5+5);
g2d.drawLine(x[33]+5,y5+4,x[35]-5,y5+4);
g2d.drawLine(x[35]+5,y5+4,x[37]-5,y5+4);
g2d.drawLine(x[39]+5,y5+4,x[41]-8,y5+4);
g2d.drawLine(x[43]+5,y5+5,x[45]-8,y5+5);
g2d.drawLine(x[46]+5,y5+5,x[47]-5,y5+5);
g2d.drawLine(x[47],y5+5,x[48]-8,y5+5);
g2d.drawLine(x[48],y5+5,x[49]-10,y5+5);
g2d.drawLine(x[49],y5+5,x[50]-8,y5+5);
g2d.drawLine(x[53]-2,y5+4,x[58]-5,y5+4);
//在歌詞下方繪出彩色譜
for (int i = 0;i < notes.length; i++){
//畫簡譜小節線
g2d.setColor(color9);
if (i==0||i==5||i==10||i==16||i==17||i==22||i==27||i==33||i==38||
i==42||i==46||i == 52||i == 58) {
g2d.drawString("|", x[i], y2);
}
//畫出簡譜
g2d.setColor(color8);
g2d.drawString(simplifiedNote[i], x[i], y2);
g2d.setColor(color[i]);
g2d.fillRoundRect(x[i], y[i], width[i], height, 3,3); //畫圓角方塊
g2d.setColor(color8);
g2d.drawLine(x[i],230, x[i]+width[i], 230);//畫水平上線
g2d.setColor(color8);
g2d.drawLine(x[i],231, x[i], 429);//畫直紅線
g2d.setColor(color8);
g2d.drawLine(x[i],430, x[i]+width[i], 430);//畫水平下線
}
g2d.setColor(color9);
g2d.drawString("|",x[notes.length-1]+ width[notes.length - 1]-5 , y2);
g2d.drawString("|",x[notes.length-1]+ width[notes.length - 1]-10 , y2);
g2d.setColor(color8);
g2d.drawLine(x[notes.length-1]+ width[notes.length - 1],231, x[notes.length - 1] + width[notes.length - 1],429);//畫邊界直紅線
}
}
public class Move1 {
public static void main(String[] args) throws IOException
{
JFrame jf = new JFrame("康樂彩歌(v0)");
jf.setBounds(0, 0, 1368, 730);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setLayout(null);
Panel1 jp1 = new Panel1();
//jp.setBackground(Color.lightGray);
jp1.setBorder(BorderFactory.createLineBorder(Color.black));
JComboBox cmbox = new JComboBox();
cmbox.setBounds(10, 40, 250, 40);
cmbox.setLocation(370,25);
cmbox.setFont(new Font("新細明體", Font.PLAIN, 30));
cmbox.addItem("紫竹調");
cmbox.addItem("走一同去郊遊");
cmbox.addItem("我家門前有小河");
jf.add(cmbox);
JRadioButton rb2 = new JRadioButton("加人聲", false);
rb2.setFont(new Font("新細明體", Font.PLAIN, 20));
rb2.setBounds(635, 28, 90, 30);
jf.add(rb2);
JButton btPlay = new JButton("PLAY");
btPlay.setFont(new Font(Font.DIALOG_INPUT, Font.BOLD, 25));
btPlay.setBounds(740, 25, 100, 40);
jf.add(btPlay);
JButton btStop = new JButton("STOP");
btStop.setFont(new Font(Font.DIALOG_INPUT, Font.BOLD, 25));
btStop.setBounds(850, 25, 100, 40);
jf.add(btStop);
jf.setVisible(true);
// btPlay.addActionListener(new ActionListener() {//?按?添加事件接收器
// @Override
// public void actionPerformed(ActionEvent e) {//接受到事件后,?行下面的?理
// //System.out.println("Hello World");// 控制台打印?出
// //JOptionPane.showMessageDialog(null, "Hello World");// ?出??框,?示Hello World
// }
// });
jf.add(jp1);
jp1.display1();
}
}
# 1 楼答案
我忘了给jPanel设置障碍，这就是为什么其他组件被jPanel的范围覆盖了。现在我把jp。杰帕内尔的挫折（0,8022001050），现在一切正常。下面列出了更正后的代码：