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FunctionPointerDemo.java

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import java.util.Arrays;

interface FunctionWrapper {

int methodSignature(int n);

}

public class FunctionPointerDemo {

static int increment(int n) {

return n + 1;

}

static void myObjective(int[] arr, FunctionWrapper f) {

for (int i = 0; i < arr.length; ++i)

arr[i] = f.methodSignature(arr[i]);

}

public static void main(String[] args) {

int[] arr = {0, 1, 2 ,3 ,4};

FunctionWrapper functionPointer = FunctionPointerDemo::increment;

myObjective(arr, functionPointer);

System.out.println(Arrays.toString(arr));

}