小编Nav*_*avy的帖子

我试图找出我的代码发生了什么,我不断得到nullexeptionpointer问题.所以我决定减少我的代码并找出最新情况.我想删除一个特定的元素,提供要删除的索引,然后移动后面的所有元素以填充剩余的空间.

移动所有元素后,我想将数组中的最后一个元素设置为null,但是我得到错误并且不会编译.

public static void main(String[] args) {


    int [] charSort = new int[] {12, 5, 7, 4 ,26 ,20 ,1, 6 ,3 ,14, 8, 11};

    TextIO.putln("ArrayNum = [12, 5, 7, 4 ,26 ,20 ,1, 6 ,3 ,14, 8, 11]\n");

    TextIO.put("Sorted ArrayNum is:  \n");

    //IntSelecttionSort(charSort);

    TextIO.putln(Arrays.toString(charSort));

    TextIO.put("Enter: "); RemoveShift (charSort, TextIO.getInt());
}


public static void RemoveShift (int[] move, int p){

    for(int i = 0; i<move.length; i++){

        TextIO.put(i+", ");
    }
    TextIO.putln();
    for(int i = p; i<move.length-1; i++){

        move[i]=move[i+1];
    }
    move[move.length-1]=null; // …

我尝试在子类Manager中调用超类的super.toString,但它不起作用.我希望输出如下:

current data:
#Person (ID=1):
firstname: NN                  
lastname: NN                  
email: unknown
date of birth: 01.01.1970
annual pay: 0.00
#Manager:
annual base pay: 0.00
bonus: 0.00

firstname: lastname: email: date of birth: enter date (y m d)

但我得到的是没有显示超类的属性:

firstname:
lastname:
email:
date of birth: enter date (y m d)

任何建议将受到高度赞赏谢谢

 public class Person {

            private String fn;
            private String ln;
            private String email;
            private Date dob;
            private static int nextID=1;
            private final int ID=nextID++;

            Person(){
                this.fn = "NN";
                this.ln = "NN"; …