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Challenge 37.

BiFunction, Method References

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	`1`	`+package challenge31_40;`
	`2`	`+`
	`3`	`+import java.util.function.BiFunction;`
	`4`	`+`
	`5`	`+/**`
	`6`	`+ *`
	`7`	`+ * Method references`
	`8`	`+ * BiFunction and its apply method.`
	`9`	`+ */`
	`10`	`+public class Challenge_37 {`
	`11`	`+`
	`12`	`+ public static void main( String[] args ) {`
	`13`	`+ BiFunction<Integer, Integer, Integer> add = Challenge_37::add;`
	`14`	`+ int result = add.apply(10,20);`
	`15`	`+`
	`16`	`+ BiFunction<Double, Float, Integer> substract = Challenge_37::substract;`
	`17`	`+ result+= substract.apply(10D, (float)10D);`
	`18`	`+ System.out.println("result = " + result);`
	`19`	`+ }`
	`20`	`+`
	`21`	`+ static int add(double a, double b){`
	`22`	`+ return (int)(a+b);`
	`23`	`+ }`
	`24`	`+`
	`25`	`+ static int substract(double a, double b){`
	`26`	`+ return (int)(a-b+a);`
	`27`	`+ }`
	`28`	`+`
	`29`	`+}`

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