Java Array newInstance() Method

The getInstance() method of Array class is used to create a new array with the specified component type and dimensions. If componentType is a class of type non-array or interface, the new array has dimensions.length dimensions and componentType as its component type.

Syntax

public static Object newInstance(Class<?> componentType, int length)
      throws NegativeArraySizeException


public static Object newInstance(Class<?> componentType,  int... dimensions)
      throws IllegalArgumentException,
             NegativeArraySizeException

Parameter

componentType - the object representing the component type of the new array

dimensions - an array of int representing the dimensions of the new array

Returns

the new array

Throws

NullPointerException

IllegalArgumentException

ArrayIndexOutOfBoundsException -

NegativeArraySizeException

Example 1

//import statement

import java.lang.reflect.Array;

public class ReflectArraynewInstanceExample1 {
   public static void main(String[] args) {

      String[][] strarr = (String[][]) Array.newInstance(String.class, 3,3);

      Array.set(strarr[0], 0, "javaTpoint");
      Array.set(strarr[1], 1, ".Net");
      Array.set(strarr[2], 2, "c#");

      System.out.println("Array[0][0] = " + Array.get(strarr[0], 0));
      System.out.println("Array[1][1] = " + Array.get(strarr[1], 1));
      System.out.println("Array[2][2] = " + Array.get(strarr[2], 2));
   }
}

Test it Now

Output:

Array[0][0] = javaTpoint
Array[1][1] = .Net
Array[2][2] = c#

Example 2

import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Arrays;

public class ReflectArraynewInstanceExample2  {

    public static void main(String... args) {
        int lnth = 4;
        Object obj = Array.newInstance(BigDecimal.class, lnth);
        for (int i = 0; i < lnth; i++) {
            Array.set(obj, i, BigDecimal.valueOf(i));
        }
        System.out.println(Arrays.toString((Object[]) obj));
    }
}

Test it Now

Output: