Java Array newInstance() Method

by Online Tutorials Library July 22, 2022

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, “tutorAspire”);        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] = TutorAspire 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:

[0, 1, 2, 3]

Next TopicJava Array Class

Java Array newInstance() Method

Java Array newInstance() Method

Syntax

Parameter

Returns

Throws

Example 1

Example 2

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