Question

我写的Java里面的一个窗体程序运行之后显示的用Graphic画出来的图形总是一直在刷新怎么办

public class Exercise2 extends JFrame{
private final int WINDOW_WIDTH = 500; // the width of a window
private final int WINDOW_HEIGHT = 420; // the height of a window
private JMenuBar menuBar;
private JPanel panel;
private JMenu shapesMenu, colorMenu,drawingModeMenu;
private JMenuItem rectangleItem，ovalItem，polygonItem，colorChooserItem;
private JRadioButtonMenuItem fillItem，unfillItem;
private Color selectedColor;
private int i;
public void paint(Graphics g) {
int[] xCoords = { 200, 300, 395, 300, 200, 100};
int[] yCoords = { 105, 105, 210, 315, 315, 210};
super.paint(g);
g.setColor(selectedColor);
if(i == 1){
if(unfillItem.isSelected()){
g.drawRect(150, 140, 200, 140);
}else{
g.fillRect(150, 140, 200, 140);
}
}
else if(i == 2){
if(unfillItem.isSelected()){
g.drawOval(150, 140, 200, 140);
}else{
g.fillOval(150, 140, 200, 140);
}
}
else if(i == 3){
if(unfillItem.isSelected()){
g.drawPolygon(xCoords, yCoords, 6);
}else{
g.fillPolygon(xCoords, yCoords, 6);
}
}
Exercise2.this.repaint();
}
public class MenuListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
if(unfillItem.isSelected()){
if(e.getSource() == rectangleItem){
i = 1;
}else if(e.getSource() == ovalItem){
i = 2;
}
else if(e.getSource() == polygonItem){
i = 3;
}
else if(e.getSource() == colorChooserItem){
i = 4;
}
}
else{
if(e.getSource() == rectangleItem){
i = 1;
}
else if(e.getSource() == ovalItem){
i = 2;
}
else if(e.getSource() == polygonItem){
i = 3;
}
else if(e.getSource() == colorChooserItem){
i = 4;
}
}
}
}
}
那些其他部分因为补充太长就没写，事件监听的关联我都加了的，那些变量我也都创建过的

Answer 1

public class Exercise2 extends JFrame{
private final int WINDOW_WIDTH = 500; // the width of a window
private final int WINDOW_HEIGHT = 420; // the height of a window
private JMenuBar menuBar;
private JPanel panel;
private JMenu shapesMenu, colorMenu,drawingModeMenu;
private JMenuItem rectangleItem，ovalItem，polygonItem，colorChooserItem;
private JRadioButtonMenuItem fillItem，unfillItem;
private Color selectedColor;
private int i;
public void paint(Graphics g) {
int[] xCoords = { 200, 300, 395, 300, 200, 100};
int[] yCoords = { 105, 105, 210, 315, 315, 210};
super.paint(g);
g.setColor(selectedColor);
if(i == 1){
if(unfillItem.isSelected()){
g.drawRect(150, 140, 200, 140);
}else{
g.fillRect(150, 140, 200, 140);
}
}
else if(i == 2){
if(unfillItem.isSelected()){
g.drawOval(150, 140, 200, 140);
}else{
g.fillOval(150, 140, 200, 140);
}
}
else if(i == 3){
if(unfillItem.isSelected()){
g.drawPolygon(xCoords, yCoords, 6);
}else{
g.fillPolygon(xCoords, yCoords, 6);
}
}
Exercise2.this.repaint();
}
public class MenuListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
if(unfillItem.isSelected()){
if(e.getSource() == rectangleItem){
i = 1;
}else if(e.getSource() == ovalItem){
i = 2;
}
else if(e.getSource() == polygonItem){
i = 3;
}
else if(e.getSource() == colorChooserItem){
i = 4;
}
}
else{
if(e.getSource() == rectangleItem){
i = 1;
}
else if(e.getSource() == ovalItem){
i = 2;
}
else if(e.getSource() == polygonItem){
i = 3;
}
else if(e.getSource() == colorChooserItem){
i = 4;
}
}
}
}
}
总是一直刷新是不是哪里死循环了，检查一下代码。

追问

我根本就没有写循环啊，只写了if-else语句啊，还是循环在我不知道的地方