private int c;这行运行出错，请问是为什么呢？

Question

package com.helloweenvsfei.struts2.action;

public class loginPerson {
private int a;
private int b;
private int c;
c=a+b;
}

Answer 1

class里面不能赋值c=a+b;放到一个方法（函数）里面

Answer 2

private int c = a + b;或者把c=a+b写在某个方法中