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MyBiOp.java
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MyBiOp.java
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// ELW-LambdaInter/MyBiOp.java
import java.util.ArrayList;
import java.util.List;
@FunctionalInterface
interface MyBiOpInterface<T> {
T apply(T a, T b);
}
class Mult implements MyBiOpInterface<Double> {
@Override
public Double apply(Double a, Double b) { return a*b; }
}
public class MyBiOp {
public static void main (String[] args) {
List<MyBiOpInterface<Double>>
opers = new ArrayList<>();
// addition - reference to (static) method
opers.add( Double::sum );
// subtraction - anonymous class
opers.add( new MyBiOpInterface<Double>() {
@Override
public Double apply(Double a, Double b) {
return a - b;
}
});
// multiplication - object of a named class
// implementing the MyBiOpInterface interface
opers.add( new Mult() );
// division - lambda
opers.add( (a,b) -> a/b );
// with closure ('shift' is effectively final)
int shift = 10;
opers.add( (a,b) -> a/b + shift);
for (MyBiOpInterface<Double> op : opers)
System.out.println(op.apply(10.5,3.5));
}
}