日期:2014-05-20  浏览次数:20763 次

其实是个小问题。。求解决
Java code

public class Student
{

    private String id;
    private String name;
    private int score;
    
    public Student()
    {
        
    }
    public Student(String id,String name,int score)
    {
        this.id = id;
        this.name = name;
        this.score= score;
    }
    
    public void setRecord(String id,String name,int score)
    {
        this.id = id;
        this.name = name;
        this.score = score;
    }
    
    public int getRecord(String id)
    {
        if(id.equals(this.id))
            return this.score;
        return 0;


    }
    public static void main(String[] args)
    {    
        Student[] students = new Student[5];
        students[0].setRecord("10", "wu", 51);
        students[1].setRecord("11", "we", 52);
        students[2].setRecord("12", "ww", 53);
        students[3].setRecord("13", "wq", 54);
        students[4].setRecord("14", "wt", 55);
        int s = 0;
        for (int i = 0; i < 5; i++)
        {
            s= students[i].getRecord("10");
        }
        System.out.println("" + s);
    }

}





这个代码为什么会出错呢?要怎样解决?请指导,给出正确代码。。

------解决方案--------------------
Student[] students = new Student[5];
students[0].setRecord("10", "wu", 51);
你只是创建的放5个Student类型的数组,分配了空间!但是里面放的值都是null;

students[0] = new Student();