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How to initialize an array using lambda expression in Java?
An array is a fixed size element of the same type. The lambda expressions can also be used to initialize arrays in Java. But generic array initializes cannot be used.
Example-1
interface Algebra {
int operate(int a, int b);
}
public class LambdaWithArray1 {
public static void main(String[] args) {
// Initialization of an array in Lambda Expression
Algebra alg[] = new Algebra[] {
(a, b) -> a+b,
(a, b) -> a-b,
(a, b) -> a*b,
(a, b) -> a/b
};
System.out.println("The addition of a and b is: " + alg[0].operate(30, 20));
System.out.println("The subtraction of a and b is: " + alg[1].operate(30, 20));
System.out.println("The multiplication of a and b is: " + alg[2].operate(30, 20));
System.out.println("The division of a and b is: " + alg[3].operate(30, 20));
}
}Output
The addition of a and b is: 50 The subtraction of a and b is: 10 The multiplication of a and b is: 600 The division of a and b is: 1
Example-2
interface CustomArray<V> {
V arrayValue();
}
public class LambdaWithArray2 {
public static void main(String args[]) {
// Initilaize an array in Lambda Expression
CustomArray<String>[] strArray = new CustomArray[] {
() -> "Adithya",
() -> "Jai",
() -> "Raja",
() -> "Surya"
};
System.out.println(strArray[0].arrayValue());
System.out.println(strArray[1].arrayValue());
System.out.println(strArray[2].arrayValue());
System.out.println(strArray[3].arrayValue());
}
}Output
Adithya Jai Raja Surya
Updated on: 11-Jul-2020
1K+ Views
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