Array setFloat() method in Java

The java.lang.reflect.Array.setFloat() is an inbuilt method in Java and is used to change a specified float value to a specified index of a given object array.

Syntax:

Array.setFloat(Object []array, int index, float value)

Parameter: This method takes three parameters:

• array: This is an array of type Object which is to be updated.
• index: This is the index of the array which is to be updated.
• value: This is the float value that is to be set at the given index of the given array.

Return Value : Since this method has a void return type, hence it doesn’t returns any value. The update reflects upon the Object array passed as the argument.

Exception: This method throws following exceptions:

• NullPointerException– when the array is null.
• IllegalArgumentException– when the given object array is not an Array.
• ArrayIndexOutOfBoundsException– if the given index is not in the range of the size of the array.

Below is the implementation of Array.setFloat() method:

Program 1:








// Java code to demonstrate // setFloat() method of Array class    import java.lang.reflect.Array; public class GfG {        // main method     public static void main(String[] args)     {         // Declaring and defining float array         float f[] = { 1.0f, 2.0f, 3.0f };            System.out.print("Before Set : ");            // printing the array         for (float x : f) {             System.out.print(x + " ");         }            float value = 4.0f;            // setFloat method of class Array         Array.setFloat(f, 1, value);            System.out.print("\nAfter Set : ");            // printing array         for (float x : f) {             System.out.print(x + " ");         }     } }
Output:

Before Set : 1.0 2.0 3.0 
After Set : 1.0 4.0 3.0

Program 2: To demonstrate java.lang.NullPointerException








// Java code to demonstrate // setFloat() method of Array class    import java.lang.reflect.Array; public class GfG {        // main method     public static void main(String[] args)     {         // Declaring and defining float array to null         float b[] = null;            try {             float c = 1.0f;             // Passing null array as parameter             Array.setFloat(b, 5, c);         }         catch (Exception e) {             System.out.println("Exception : " + e);         }     } }
Output:

Exception : java.lang.NullPointerException

Program 3: To demonstrate java.lang.ArrayIndexOutOfBoundsException








// Java code to demonstrate setFloat() // method of Array class    import java.lang.reflect.Array; public class GfG {        // main method     public static void main(String[] args)     {         // Declaring and defining float array         float b[] = { 1.0f, 2.0f, 3.0f };            try {             float c = 1.0f;                // Passing index as 5 in parameter             // when the size of array is 3             Array.setFloat(b, 5, c);         }         catch (Exception e) {             System.out.println("Exception : " + e);         }     } }
Output:

Exception : java.lang.ArrayIndexOutOfBoundsException

Program 4: To demonstrate java.lang.IllegalArgumentException








// Java code to demonstrate setFloat() // method of Array class    import java.lang.reflect.Array; public class GfG {        // main method     public static void main(String[] args)     {         // Declaring and defining float variable         float b = 2.0f;            try {             float c = 1.0f;                // Passing variable as parameter             // where an array is expected.             Array.setFloat(b, 5, c);         }         catch (Exception e) {             System.out.println("Exception : " + e);         }     } }
Output:

Exception : java.lang.IllegalArgumentException: Argument is not an array