这是我的代码。它从save.txt文件中读取，它获得BMG = 1。它打印出应该具有的作品，但它不会将标签设置为可见。我从另一个班级运行该程序。
public void openFile(){
try{
x=new Scanner(new File("save.txt"));
}catch(Exception e){
System.out.println("Could not find save file!");
}
}
public void readFile(){
while(x.hasNext()){
String a = x.next();
if(a.equals("BMG=1")){
System.out.println("works");
bronze.setVisible(true);
}
System.out.println(a);
}
}
public void closeFile(){
x.close();
}
此处为完整代码。对不起，如果它非常混乱它只是因为我测试的东西，我只是不断添加这个：）
back.setSize(1280,800);
back.setLocation(0,0);
bronze.setSize(50,55);
bronze.setLocation(10,50);
bronze.repaint();
silver.setSize(50,55);
silver.setLocation(10,105);
silver.repaint();
gold.setSize(50,55);
gold.setLocation(10,210);
gold.repaint();
timer.setSize(200,40);
timer.setLocation(10,20);
add(timer);
setLayout(null);
scorelbl.setSize(100, 20);
scorelbl.setLocation(10, 10);
add(bronze);
add(silver);
bronze.setVisible(false);
silver.setVisible(false);
add(scorelbl);
Random X=new Random();
int x=X.nextInt(1100-50)+50;
Random Y=new Random();
int y=Y.nextInt(650-50)+50;
easy.setSize(100,30);
easy.setLocation(400, 10);
add(easy);
scorelbl.setForeground(Color.YELLOW);
timer.setForeground(Color.YELLOW);
easy.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(started==true){
JOptionPane.showMessageDialog(null, "You can't change the difficulty of the game while its running!"
,"Error: Tried Changing Difficulty while running",JOptionPane.INFORMATION_MESSAGE);
}else{
wait=4;
}
}
});
medium.setSize(100,30);
medium.setLocation(500, 10);
add(medium);
medium.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(started==true){
JOptionPane.showMessageDialog(null, "You can't change the difficulty of the game while its running!"
,"Error: Tried Changing Difficulty while running",JOptionPane.INFORMATION_MESSAGE);
}else{
wait=3;
}
}
});
hard.setSize(100,30);
hard.setLocation(600, 10);
add(hard);
hard.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(started==true){
JOptionPane.showMessageDialog(null, "You can't change the difficulty of the game while its running!"
,"Error: Tried Changing Difficulty while running",JOptionPane.INFORMATION_MESSAGE);
}else{
wait=2;
}
}
});
insane.setSize(100,30);
insane.setLocation(700, 10);
add(insane);
insane.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(started==true){
JOptionPane.showMessageDialog(null, "You can't change the difficulty of the game while its running!"
,"Error: Tried Changing Difficulty while running",JOptionPane.INFORMATION_MESSAGE);
}else{
wait=1;
}
}
});
aim.setSize(20, 20);
aim.setLocation(x,y);
aim.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
Random X=new Random();
int x=X.nextInt(1100-50)+50;
Random Y=new Random();
int y=Y.nextInt(650-50)+50;
aim.setLocation(x, y);
score+=1;
scorelbl.setText("Your Score is "+score+"!");
tm.start();
seconds=0;
started=true;
if(score==2 && wait==3){
bronze.setVisible(true);
}
if(score==3 && wait==3){
silver.setVisible(true);
}
}
});
add(aim);
add(back);
}
public void openFile(){
try{
x=new Scanner(new File("save.txt"));
}catch(Exception e){
System.out.println("Could not find save file!");
}
}
public void readFile(){
while(x.hasNext()){
String a = x.next();
if(a.equals("BMG=1")){
System.out.println("works");
bronze.setVisible(true);
}
System.out.println(a);
}
}
public void closeFile(){
x.close();
}
public static void main(String[] args){
}
Thread thread= new Thread();
public void actionPerformed(ActionEvent e) {
counter--;
timer.setText("Seconds Until Finish "+counter);
if(counter==0){
tm.stop();
JOptionPane.showMessageDialog(null,"You've finished with a score of "+score+". Press OK to exit!","Time's Up!",JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}
seconds++;
if(seconds==wait){
Random X=new Random();
int x=X.nextInt(1100-50)+50;
Random Y=new Random();
int y=Y.nextInt(650-50)+50;
aim.setLocation(x, y);
seconds=0;
}
}
}
答案 0 :(得分：3)
bronze.setSize(50,55);
bronze.setLocation(10,50);
bronze.repaint();
silver.setSize(50,55);
silver.setLocation(10,105);
silver.repaint();
gold.setSize(50,55);
gold.setLocation(10,210);
gold.repaint();
在我看来，你正试图让3个组件共享同一个位置。这不行。
相反，你应该做的是：
使用单个JLabel。然后，您可以将图标更改为青铜色，银色或金色图标。您可以使用setIcon(...)方法执行此操作。
使用卡片布局。然后将3个组件添加到卡中，并使用CardLayout中的方法一次显示一个组件。阅读How to Use CardLayout上Swing教程中的部分，了解更多信息和示例。
此外，请勿使用空布局!!!
Swing旨在与布局管理器一起使用。当您查看上面的链接时，您还可以查看Layout Managers部分。
答案 1 :(得分：0)
如果它在Android中你必须调用UI主线程来更新UI。
#include <string.h> //you need this for string comparison
char a[10]; //arbitrary size, just make sure it's big enough for the input
scanf("%s", a);
//OR
fgets(a, sizeof(a), stdin); //use fgets if you need to read more than one word, scanf stops reading at whitespace
//don't use == to compare strings
if (!strcmp(a, "yes")){ //use quotes to delimit "words"
printf("OK\n");
}