作如下修改 即可
import javax.swing.JOptionPane;
public class test01 {
public static void main(String sgs[]) {
String num = JOptionPane.showInputDialog("请输入要转换的数字:");
int number = Integer.parseInt(num);
System.out.println("该数的二进制数值为:");
int sum;
String result = "";
for (int i = number; i >= 1; i /= 2) {
if (i % 2 == 0) {
sum = 0;
} else {
sum = 1;
}
result = sum + result;
}
System.out.print(result);
}
}