How can an array be printed as a string in java without using any standard library functions like rr-CodePudding

i need to write a method to print an array as a string ,

for example : int[] example = {1,2,3,4,5};

System.out.println(arrayToString(example));

output : [1, 2, 3, 4, 5]

CodePudding user response：

Quick example:

int[] example = {1,2,3,4,5};
System.out.println(arrayToString(example));

With the helper function:

public static String arrayToString(int[] arr) {
    String output = "[";
    for(int i=0; i<arr.length; i  ) {
        output = output   arr[i];
        if (i<(arr.length-1)) {
            output = output   ", ";
        } 
    }
    return output   "]";
}

There are more efficient ways to handle the building of the String, but this is the bare bones method, which is easy enough for beginners to understand.

CodePudding user response：

You can use StringJoiner to join the string with a delimiter. Try the below function:

private static String arraytoString(int[] arr) {
    StringJoiner stringJoiner = new StringJoiner(",");
    for (int i : arr) {
        stringJoiner.add(String.valueOf(i));
    }
    return "["   stringJoiner   "]";
}

Example uses:

int[] example = {1, 2, 3, 4, 5};
System.out.println(arraytoString(example));