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How to convert an object array to an integer array in Java?
You can convert an object array to an integer array in one of the following ways −
- By copying each element from integer array to object array −
Example
import java.util.Arrays;
public class ObjectArrayToStringArray {
public static void main(String args[]){
Object[] objArray = {21, 58, 69, 33, 65};
int length = objArray.length;
int intArray[] = new int[length];
for(int i=0; i<length; i++){
intArray[i] = (int) objArray[i];
}
System.out.println("Contents of the integer array: "+Arrays.toString(intArray));
}
}Output
Contents of the integer array: [21, 58, 69, 33, 65]
- Using the arrayCopy() method of the System class −
Example
import java.util.Arrays;
public class ObjectArrayToStringArray {
public static void main(String args[]){
Object[] objArray = {21, 58, 69, 33, 65};
int length = objArray.length;
Integer intArray[] = new Integer[length];
System.arraycopy(objArray, 0, intArray, 0, length);
System.out.println("Contents of the integer array: "+Arrays.toString(intArray));
}
}Output
Contents of the integer array: [21, 58, 69, 33, 65]
- Using the copyOf() method of the arrays class −
Example
import java.util.Arrays;
public class ObjectArrayToStringArray {
public static void main(String args[]){
Object[] objArray = {21, 58, 69, 33, 65};
int length = objArray.length;
Integer[] intArray = Arrays.copyOf(objArray, length, Integer[].class);
System.out.println("Contents of the integer array: "+Arrays.toString(intArray));
}
}Output
Contents of the integer array: [21, 58, 69, 33, 65]
- Using the toArray() method of the List class −
Example
import java.util.Arrays;
public class ObjectArrayToStringArray {
public static void main(String args[]){
Object[] objArray = {21, 58, 69, 33, 65};
Integer[] intArray = Arrays.asList(objArray).toArray(new Integer[0]);
System.out.println("Contents of the integer array: "+Arrays.toString(intArray));
}
}Output
Contents of the integer array: [21, 58, 69, 33, 65]
Updated on 30-Jul-2019 22:30:26
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