String representation of all values of nums, with the values separated by spaces-CodePudding

Here is the code I thought should work but I am missing something:

public String arrayToString(int[] nums){
      String str;
      int[] results = new int[nums.length];
       for(int i = 0; i < nums.length; i  ){
          String string = "[1 , 2, 3, 4]";
       }
      return str;
}

This should return all the values of nums with spaces or do I need to switch the string?

I have tried to use the toString option which for some reason is not allowed in the IDE I am using as it is not using JRE 17 I believe the error message said. So that was not an option since I could not use java.lang.String.

CodePudding user response：

You're actually doing quite nothing to reach your goal, you don't use nums values, and have defined a strange String string = "[1 , 2, 3, 4]";

You need to append all the values of nums to reach your goal, here are some ways

An array-style with existing method

// '[1, 5, 8, 98]'
public static String arrayToString(int[] nums) {
    return Arrays.toString(nums);
}

A concatenatde-values style

// '1,5,8,98'
public static String arrayToString(int[] nums) {
    StringBuilder result = new StringBuilder();
    String separator = "";
    for (int num : nums) {
        result.append(separator).append(num);
        separator = ",";
    }
    return result.toString();
}

Same with brackets

// '[1,5,8,98]'
public static String arrayToString(int[] nums) {
    StringBuilder result = new StringBuilder("[");
    String separator = "";
    for (int num : nums) {
        result.append(separator).append(num);
        separator = ",";
    }
    return result.append("]").toString();
}