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What kind of variables can we access in a lambda expression in Java?
The lambda expressions consist of two parts, one is parameter and another is an expression and these two parts have separated by an arrow (->) symbol. A lambda expression can access a variable of it's enclosing scope.
A Lambda expression has access to both instance and static variables of it's enclosing class and also it can access local variables which are effectively final or final.
Syntax
( argument-list ) -> expression
Example
interface TestInterface {
void print();
}
public class LambdaExpressionTest {
int a; // instance variable
static int b; // static variable
LambdaExpressionTest(int x) { // constructor to initialise instance variable
this.a = x;
}
void show() {
// lambda expression to define print() method
TestInterface testInterface = () -> {
// accessing of instance and static variable using lambda expression
System.out.println("Value of a is: "+ a);
System.out.println("Value of b is: "+ b);
};
testInterface.print();
}
public static void main(String arg[]) {
LambdaExpressionTest test = new LambdaExpressionTest(10);
test.show();
}
}Output
Value of a is: 10 Value of b is: 0
Updated on: 11-Dec-2019
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