您好我们需要在Jframe中添加多个类：
import javax.swing.JFrame;
public class Concert
{
public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.setSize(1000, 800);
frame.setTitle("Concert!");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Concertbackground component = new Concertbackground();
frame.add(component);
BandComponent component1 = new BandComponent();
frame.add(component1);
frame.setVisible(true);
}
}
这里是我们的一些课程，我们很困惑如何同时显示所有课程，而不会过度编写显示的上一个图形。
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import javax.swing.JComponent;
import java.awt.GradientPaint;
/*
component that draws the concert background
*/
public class Concertbackground extends JComponent
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
// Recover Graphics2D
Graphics2D g2 = (Graphics2D) g;
//Background Top
g2.setColor(Color.BLUE);
Rectangle backgroundTop = new Rectangle (0, 0, getWidth(), getHeight() / 4);
g2.fill(backgroundTop);
// Background bottom
g2.setColor(Color.GREEN);
Rectangle backgroundBottom = new Rectangle (0, getHeight() / 2, getWidth(), getHeight() / 2);
g2.fill(backgroundBottom);
// Speaker base
g2.setColor(Color.BLACK);
Rectangle base = new Rectangle (0, 0, 50, 100);
g2.fill(base);
// Speakers circles gray top
g2.setColor(Color.DARK_GRAY);
Ellipse2D.Double speakerTop = new Ellipse2D.Double(10, 10, 30, 30);
g2.fill(speakerTop);
//speakers circles black top
g2.setColor(Color.BLACK);
Ellipse2D.Double speakerTop1 = new Ellipse2D.Double(15, 15, 20, 20);
g2.fill(speakerTop1);
// Speakers circles gray bottom
g2.setColor(Color.DARK_GRAY);
Ellipse2D.Double speakerBottom = new Ellipse2D.Double(10, 50, 30, 30);
g2.fill(speakerBottom);
//speakers circles black bottom
g2.setColor(Color.BLACK);
Ellipse2D.Double speakerBottom1 = new Ellipse2D.Double(15, 55, 20, 20);
g2.fill(speakerBottom1);
}
}
public class BandComponent extends JComponent
{
public void paintComponent(Graphics g)
{
// Recover Graphics2D
Graphics2D g2 = (Graphics2D) g;
int xScale = 250;
int yScale = 100;
int x = 343;
int y = 343;
//singer
Polygon sing = new Polygon();
sing.addPoint(667 ,208 + xScale);
sing.addPoint(676,213 + xScale);
sing.addPoint(678,217 + xScale);
sing.addPoint(682,221 + xScale);
sing.addPoint(681,224 + xScale);
sing.addPoint(680,231 + xScale);
sing.addPoint(676,242 + xScale);
sing.addPoint(672,244 + xScale);
sing.addPoint(672,250 + xScale);
sing.addPoint(682,248 + xScale);
sing.addPoint(713,244 + xScale);
sing.addPoint(734,247 + xScale);
sing.addPoint(750,247 + xScale);
sing.addPoint(794,232 + xScale);
sing.addPoint(800,231 + xScale);
sing.addPoint(801,223 + xScale);
sing.addPoint(807,219 + xScale);
sing.addPoint(806,221 + xScale);
sing.addPoint(806,229 + xScale);
sing.addPoint(818,222 + xScale);
sing.addPoint(820,223 + xScale);
sing.addPoint(825,227 + xScale);
sing.addPoint(825,240 + xScale);
sing.addPoint(817,243 + xScale);
sing.addPoint(807,245 + xScale);
sing.addPoint(803,247 + xScale);
sing.addPoint(801,252 + xScale);
sing.addPoint(781,257 + xScale);
sing.addPoint(762,264 + xScale);
sing.addPoint(734,271 + xScale);
sing.addPoint(701,286 + xScale);
sing.addPoint(691,296 + xScale);
sing.addPoint(693,311 + xScale);
sing.addPoint(690,317 + xScale);
sing.addPoint(690,335 + xScale);
sing.addPoint(691,339 + xScale);
sing.addPoint(689,343 + xScale);
sing.addPoint(712,382 + xScale);
sing.addPoint(725,400 + xScale);
sing.addPoint(731,418 + xScale);
sing.addPoint(731,428 + xScale);
sing.addPoint(738,454 + xScale);
sing.addPoint(741,460 + xScale);
sing.addPoint(746,468 + xScale);
sing.addPoint(766,468 + xScale);
sing.addPoint(771,481 + xScale);//
sing.addPoint(723,482 + xScale);
sing.addPoint(720,462 + xScale);
sing.addPoint(718,454 + xScale);
sing.addPoint(709,436 + xScale);
sing.addPoint(703,436 + xScale);
sing.addPoint(699,417 + xScale);
sing.addPoint(686,396 + xScale);
sing.addPoint(678,395 + xScale);
sing.addPoint(676,437 + xScale);
sing.addPoint(673,439 + xScale);
sing.addPoint(638,435 + xScale);
sing.addPoint(640,398 + xScale);
sing.addPoint(634,410 + xScale);
sing.addPoint(625,416 + xScale);
sing.addPoint(622,436 + xScale);
sing.addPoint(622,443 + xScale);
sing.addPoint(615,447 + xScale);
sing.addPoint(609,456 + xScale);
sing.addPoint(606,481 + xScale);//
sing.addPoint(557,481 + xScale);
sing.addPoint(560,467 + xScale);
sing.addPoint(579,467 + xScale);
sing.addPoint(587,464 + xScale);
sing.addPoint(593,452 + xScale);
sing.addPoint(594,441 + xScale);
sing.addPoint(592,434 + xScale);
sing.addPoint(600,416 + xScale);
sing.addPoint(608,405 + xScale);
sing.addPoint(609,394 + xScale);
sing.addPoint(617,376 + xScale);
sing.addPoint(619,363 + xScale);
sing.addPoint(632,334 + xScale);
sing.addPoint(637,324 + xScale);
sing.addPoint(635,314 + xScale);
sing.addPoint(639,296 + xScale);
sing.addPoint(627,285 + xScale);
sing.addPoint(600,279 + xScale);
sing.addPoint(582,278 + xScale);
sing.addPoint(575,275 + xScale);
sing.addPoint(546,256 + xScale);
sing.addPoint(536,252 + xScale);
sing.addPoint(533,350 + xScale);
sing.addPoint(534,361 + xScale);
sing.addPoint(532,367 + xScale);
sing.addPoint(529,369 + xScale);
sing.addPoint(524,363 + xScale);
sing.addPoint(525,355 + xScale);
sing.addPoint(531,254 + xScale);
sing.addPoint(527,249 + xScale);
sing.addPoint(527,242 + xScale);
sing.addPoint(529,237 + xScale);
sing.addPoint(532,237 + xScale);
sing.addPoint(536,178 + xScale);
sing.addPoint(534,129 + xScale);
sing.addPoint(535,123 + xScale);
sing.addPoint(541,120 + xScale);
sing.addPoint(545,123 + xScale);
sing.addPoint(547,131 + xScale);
sing.addPoint(545,173 + xScale);
sing.addPoint(538,233 + xScale);
sing.addPoint(549,239 + xScale);
sing.addPoint(558,241 + xScale);
sing.addPoint(585,257 + xScale);
sing.addPoint(599,257 + xScale);
sing.addPoint(627,254 + xScale);
sing.addPoint(647,251 + xScale);
sing.addPoint(653,248 + xScale);
sing.addPoint(652,235 + xScale);
sing.addPoint(648,226 + xScale);
sing.addPoint(652,218 + xScale);
sing.addPoint(661,212 + xScale);
g2.setColor(Color.black);
g2.fill(sing);
g2.draw(sing);
//guitar
Polygon guitar = new Polygon();
guitar.addPoint(148,28);
guitar.addPoint(158,32);
guitar.addPoint(164,38);
guitar.addPoint(168,46);
guitar.addPoint(169,52);
guitar.addPoint(167,60);
guitar.addPoint(164,65);
guitar.addPoint(165,70);
guitar.addPoint(161,76);
guitar.addPoint(158,92);
guitar.addPoint(162,97);
guitar.addPoint(161,102);
guitar.addPoint(158,106);
guitar.addPoint(155,108);
guitar.addPoint(151,127);
guitar.addPoint(152,133);
guitar.addPoint(155,137);
guitar.addPoint(151,146);
guitar.addPoint(153,147);
guitar.addPoint(160,142);
guitar.addPoint(162,133);
guitar.addPoint(162,123);
guitar.addPoint(161,113);
guitar.addPoint(162,110);
guitar.addPoint(164,117);
guitar.addPoint(169,131);
guitar.addPoint(171,144);
guitar.addPoint(170,159);
guitar.addPoint(166,167);
guitar.addPoint(166,171);
guitar.addPoint(174,174);
guitar.addPoint(183,184);
guitar.addPoint(191,195);
guitar.addPoint(196,198);
guitar.addPoint(198,200);
guitar.addPoint(199,210);
guitar.addPoint(211,225);
guitar.addPoint(212,233);
guitar.addPoint(220,248);
guitar.addPoint(233,260);
guitar.addPoint(245,266);
guitar.addPoint(248,268);
guitar.addPoint(249,277);
guitar.addPoint(205,275);
guitar.addPoint(204,262);
guitar.addPoint(187,238);
guitar.addPoint(178,224);
guitar.addPoint(177,216);
guitar.addPoint(156,201);
guitar.addPoint(146,197);
guitar.addPoint(134,211);
guitar.addPoint(128,229);
guitar.addPoint(125,244);//
guitar.addPoint(121,246);
guitar.addPoint(107,248);
guitar.addPoint(100,252);
guitar.addPoint(97,258);
guitar.addPoint(96,253);
guitar.addPoint(89,258);
guitar.addPoint(65,267);
guitar.addPoint(63,274);
guitar.addPoint(64,283);
guitar.addPoint(41,282);
guitar.addPoint(44,270);
guitar.addPoint(47,264);
guitar.addPoint(51,255);
guitar.addPoint(73,238);
guitar.addPoint(79,228);
guitar.addPoint(97,222);
guitar.addPoint(101,204);
guitar.addPoint(102,181);
guitar.addPoint(100,170);
guitar.addPoint(95,161);
guitar.addPoint(97,154);
guitar.addPoint(91,152);
guitar.addPoint(77,131);
guitar.addPoint(65,123);
guitar.addPoint(61,105);
guitar.addPoint(64,94);
guitar.addPoint(72,91);
guitar.addPoint(78,82);
guitar.addPoint(78,76);
guitar.addPoint(70,73);
guitar.addPoint(70,67);
guitar.addPoint(93,51);
guitar.addPoint(101,48);
guitar.addPoint(111,52);
guitar.addPoint(118,59);
guitar.addPoint(119,70);
guitar.addPoint(117,78);
guitar.addPoint(113,79);
guitar.addPoint(112,86);
guitar.addPoint(111,88);
guitar.addPoint(109,89);
guitar.addPoint(109,92);
guitar.addPoint(122,99);//
guitar.addPoint(124,99);
guitar.addPoint(133,96);
guitar.addPoint(145,93);
//guitar.addPoint(138,124);
guitar.addPoint(150,69);
guitar.addPoint(150,62);
guitar.addPoint(155,58);
guitar.addPoint(154,53);
guitar.addPoint(149,50);
guitar.addPoint(154,46);
guitar.addPoint(153,38);
guitar.addPoint(147,28);
g2.setColor(Color.black);
g2.fill(guitar);
g2.draw(guitar);
Polygon guitar2 = new Polygon ();
guitar2.addPoint(141,108);
guitar2.addPoint(139,126);
guitar2.addPoint(135,122);
guitar2.addPoint(128,122);
guitar2.addPoint(129,116);
guitar2.addPoint(143,108);
g2.setColor(Color.white);
g2.fill(guitar2);
g2.draw(guitar2);
//bass guitar
Polygon bassgt = new Polygon ();
bassgt.addPoint(871,21);
bassgt.addPoint(879,24);
bassgt.addPoint(885,32);
bassgt.addPoint(886,42);
bassgt.addPoint(895,47);
bassgt.addPoint(904,56);
bassgt.addPoint(907,69);
bassgt.addPoint(909,83);
bassgt.addPoint(910,91);
bassgt.addPoint(941,81);
bassgt.addPoint(946,75);
bassgt.addPoint(945,67);
bassgt.addPoint(950,67);
bassgt.addPoint(955,75);
bassgt.addPoint(960,68);
bassgt.addPoint(963,74);
bassgt.addPoint(967,72);
bassgt.addPoint(971,66);
bassgt.addPoint(973,70);
bassgt.addPoint(981,67);
bassgt.addPoint(984,71);
bassgt.addPoint(982,76);
bassgt.addPoint(987,80);
bassgt.addPoint(986,82);
bassgt.addPoint(980,83);
bassgt.addPoint(979,90);
bassgt.addPoint(974,85);
bassgt.addPoint(970,86);
bassgt.addPoint(973,91);
bassgt.addPoint(965,86);
bassgt.addPoint(960,90);
bassgt.addPoint(961,100);
bassgt.addPoint(955,92);
bassgt.addPoint(944,91);
bassgt.addPoint(907,103);
bassgt.addPoint(906,109);
bassgt.addPoint(893,114);
bassgt.addPoint(895,123);
bassgt.addPoint(900,131);
bassgt.addPoint(904,134);
bassgt.addPoint(908,145);
bassgt.addPoint(911,159);
bassgt.addPoint(918,171);
bassgt.addPoint(919,190);
bassgt.addPoint(923,198);
bassgt.addPoint(919,201);
bassgt.addPoint(919,210);
bassgt.addPoint(927,220);
bassgt.addPoint(942,226);
bassgt.addPoint(944,234);
bassgt.addPoint(909,230);
bassgt.addPoint(905,214);
bassgt.addPoint(899,204);
bassgt.addPoint(893,203);
bassgt.addPoint(889,171);
bassgt.addPoint(877,151);
bassgt.addPoint(861,152);
bassgt.addPoint(852,169);
bassgt.addPoint(849,203);
bassgt.addPoint(841,210);
bassgt.addPoint(840,228);
bassgt.addPoint(828,233);
bassgt.addPoint(806,235);
bassgt.addPoint(805,228);
bassgt.addPoint(822,219);
bassgt.addPoint(824,204);
bassgt.addPoint(817,201);
bassgt.addPoint(822,196);
bassgt.addPoint(822,184);
bassgt.addPoint(828,162);
bassgt.addPoint(829,152);
bassgt.addPoint(820,149);
bassgt.addPoint(811,144);
bassgt.addPoint(806,134);
bassgt.addPoint(805,117);
bassgt.addPoint(820,107);
bassgt.addPoint(819,89);
bassgt.addPoint(811,83);
bassgt.addPoint(811,77);
bassgt.addPoint(824,66);
bassgt.addPoint(825,61);
bassgt.addPoint(842,53);
bassgt.addPoint(852,43);
bassgt.addPoint(853,29);
bassgt.addPoint(870,20);
g2.setColor(Color.black);
g2.fill(bassgt);
g2.draw(bassgt);
Polygon bassgt2 = new Polygon();
bassgt2.addPoint(845,78);
bassgt2.addPoint(845,98);
bassgt2.addPoint(843,98);
bassgt2.addPoint(842,105);
bassgt2.addPoint(839,109);
bassgt2.addPoint(834,103);
bassgt2.addPoint(832,85);
bassgt2.addPoint(845,78);
g2.setColor(Color.white);
g2.fill(bassgt2);
g2.draw(bassgt2);
Polygon drums = new Polygon ();
drums.addPoint(713,104);
drums.addPoint(706,121);
drums.addPoint(721,377);
drums.addPoint(248,380);
drums.addPoint(253,228);
drums.addPoint(250,206);
drums.addPoint(237,178);
drums.addPoint(206,166);
drums.addPoint(201,154);
drums.addPoint(198,152);
drums.addPoint(208,148);
drums.addPoint(236,150);
drums.addPoint(247,130);
drums.addPoint(227,119);
drums.addPoint(219,105);
drums.addPoint(222,96);
drums.addPoint(233,88);
drums.addPoint(251,84);
drums.addPoint(272,83);
drums.addPoint(300,91);
drums.addPoint(285,72);
drums.addPoint(294,57);
drums.addPoint(319,46);
drums.addPoint(372,45);
drums.addPoint(406,50);
drums.addPoint(428,65);
drums.addPoint(433,74);
drums.addPoint(450,58);
drums.addPoint(478,48);
drums.addPoint(514,48);
drums.addPoint(544,51);
drums.addPoint(566,52);
drums.addPoint(577,67);
drums.addPoint(575,79);
drums.addPoint(561,95);
drums.addPoint(545,98);
drums.addPoint(525,105);
drums.addPoint(524,147);
drums.addPoint(524,183);
drums.addPoint(645,175);
drums.addPoint(662,143);
drums.addPoint(617,152);
drums.addPoint(608,148);
drums.addPoint(614,139);
drums.addPoint(633,128);
drums.addPoint(661,116);
drums.addPoint(659,107);
drums.addPoint(625,114);
drums.addPoint(592,113);
drums.addPoint(571,111);
drums.addPoint(565,102);
drums.addPoint(576,86);
drums.addPoint(616,70);
drums.addPoint(647,66);
drums.addPoint(679,67);
drums.addPoint(695,72);
drums.addPoint(699,90);
drums.addPoint(678,100);
drums.addPoint(667,103);
drums.addPoint(672,113);
drums.addPoint(689,105);
drums.addPoint(709,106);
g2.setColor(Color.black);
g2.fill(drums);
g2.draw(drums);
}
}
答案 0 :(得分：3)
JFrame使用BorderLayout作为布局管理器。添加2个组件并使用BorderLayout时（不指定其他选项），第二个组件将替换旧组件。您需要指定要添加组件的区域，例如：
frame.add(component, BorderLayout.CENTER);
frame.add(component1, BorderLayout.SOUTH);
或使用其他布局管理器。
请参阅：
答案 1 :(得分：2)
默认布局是BorderLayout，当你这样做时：
Concertbackground component = new Concertbackground();
frame.add(component);
BandComponent component1 = new BandComponent();
frame.add(component1);
您在同一个地方添加了component和component1。
检查BorderLayout用法或使用其他布局正确显示组件。