我正在尝试用Java编写程序,但是遇到了一些问题。我的程序是GUI。程序必须从用户那里获得two输入,检查它们是否大于0,第二个大于第一个。但最后一部分我有一个问题。
下面是我的代码:
package yazdan;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.ThreadLocalRandom;
public class Y {
public static void main(String[] args) {
{
JFrame frame = new JFrame("random number");
frame.setBounds(0, 0, 1366,727);
frame.setVisible(true);
frame.setLayout(null);
JLabel a = new JLabel("first number :");
a.setBounds(300, 250, 200, 70);
frame.add(a);
JLabel b = new JLabel("second number :");
b.setBounds(300, 350, 200, 70);
frame.add(b);
JTextField c = new JTextField();
c.setEditable(true);
c.setBounds(450, 250, 200, 70);
frame.add(c);
JTextField z = new JTextField();
z.setEditable(true);
z.setBounds(450, 350 , 200, 70);
frame.add(z);
JButton y = new JButton("submit");
y.setBounds(300, 450, 350, 70);
frame.add(y);
JLabel i = new JLabel("random number :");
i.setBounds(700, 350, 350, 70);
frame.add(i);
JTextField h = new JTextField();
h.setBounds(900, 350, 350, 70);
h.setEditable(false);
frame.add(h);
y.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
y.addActionListener(this);
String first = c.getText();
String second = z.getText();
int i1 = Integer.parseInt(first);
if (i1 < 0) {
System.out.println("the numbers must be bigger than 0"); }
int i2 = Integer.parseInt(second);
if (i2 <0) {
System.out.println("the numbers must be bigger than 0");}
if (i1 > i2) {
System.out.println("the second number must be bigger than the first ");}
else {
int n = ThreadLocalRandom.current().nextInt(i1, i2+1);
String result = String.valueOf(n);
h.setText(result);
}
}
} // here is the problem
}
}
}
这里的问题是""Syntax error, insert ";" to complete Statement""
请帮助
谢谢。
在带有语法高亮显示的编辑器中打开该源代码,然后彩色标记将显示错误的位置:
y.addActionListener(new ActionListener() {
...
} // here is the problem
计算开括号和闭括号的数量。末尾缺少一个“)”。