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45 lines (37 loc) · 1.24 KB
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import java.util.Arrays;
import java.util.List;
import stream.MyStream;
import stream.Stream;
import stream.genetator.CollectionStreamGenerator;
import stream.genetator.IntegerStreamGenerator;
/**
* @Author xiongyx
* @Date 2019/3/6
*/
public class TestMyStream {
public static void main(String[] args){
// 生成关于list的流
Stream<Integer> intStream = IntegerStreamGenerator.getIntegerStream(1,10);
// intStream基础上过滤出偶数的流
Stream<Integer> filterStream = intStream.filter(item-> item%2 == 0);
// filterStream基础上映射为平方的流
Stream<Integer> mapStream = filterStream.map(item-> item * item);
// mapStream基础上截取前三个的流
Stream<Integer> limitStream = mapStream.limit(2);
// 最终结果累加求和(初始值为0)
Integer sum = limitStream.reduce(0,(i1,i2)-> i1+i2);
System.out.println(sum); // 20
}
private static boolean idOdd(int num){
return (num % 2 != 0);
}
private static Integer square(int num){
return num * num;
}
private static Integer scaleTwo(int num){
return num * 2;
}
private static String toStr(int num){
return num + "";
}
}