public class HelloWorld{
public static void main(String[] args) {
int a=12;
int b=24;
int sum = a + b;
System.out.println("两数之和为:"+sum);
}
}
System.out.println(sum);
System.out.println(sum);
System.out.println(sum);为啥这里面不用加 双引号
System.out.println(sum);
System.out.println(sum);