java error: symbol not found

Problem description

When compiling a piece of java code, it prompts "Error: symbol not found", as follows: (Recommended: java video tutorial )

D:\practicejava>javac PrintArray.java
PrintArray.java:4: 错误: 找不到符号
                System.out.println("Array number:" + Arrays.toString(testArr));
                                                     ^
  符号:   变量 Arrays
  位置: 类 PrintArray
1 个错误

The code is as follows:

public class InsertionSort{
    public static void main(String args[]){
        int testnumber[] = {7,6,4,9,2,1,3,5,8}; //  定义数组
        for(int i=0; i0; j--){   //  将被挑选元素的后一个与被
            if(testnumber[j-1]
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The reason why this error is reported is that the Arrays class is used in the code but not referenced in the code. Just introduce it in the code, as follows:

import java.util.Arrays;

Summary

Here is the Arrays class as an example. Similarly, when encountering such problems, first check whether the corresponding class has been introduced.

For more java knowledge, please pay attention to the java basic tutorial column.

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