Arrays in Java

How to convert an array to comma separated string in java

Mallik1 Comment

package com.test;

public class ArrayTest {

public static void main(String[] args) {
ArrayTest arrayTest = new ArrayTest();
arrayTest.arrayJoin();
}

public void arrayJoin() {

String[] arrayToJoin = { “John”, “Peter”, “Tom”, “Scott” };

StringBuilder joinedString = new StringBuilder();
String seperator = “,”;
//System.out.println(“Converting to String “+arrayToJoin.toString());;
for (String value : arrayToJoin) {
joinedString.append(value).append(seperator);
}

System.out.println(“Final Result …….. ” + joinedString);
}
}

How to Copy an Array into Another Array?

Mallik1 Comment

Contents of one array can be copied into another array by using the arraycopy() method of the System class in Java.

  • arraycopy() method accepts source array, source length, destination array and destination length.
  • Following program shows the use of arraycopy() method to copy the contents of one array to another.
package com.Test;

public class ArrayCopyTest{
 public static void main(String[] args){
    int[] src = new int[] {1, 2, 3, 4, 5};
    int[] dest = new int[src.length];
    System.arraycopy(src, 0, dest, 0, src.length);
    for (int i = 0; i < dest.length; i++){
       System.out.println(dest[i]);
    }
  }
}