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Question

如何编写下面的Java 8谓词？

 public boolean isArtOrNot(int aId) {
    if(aid <= 4) {
        return true;
    } else { 
    return false;
    }
 }

Answer 1

t -> t <= 4

e.g。

example.stream().filter(t -> t <= 4)

因为该示例等同于：

public boolean isArtOrNot(int aId) {
    return aid <= 4;
}

Answer 2

简单地：

IntPredicate predicate = i -> i <= 4;

Answer 3

Predicate<Integer> isArt = (i) -> i <= 4;

Answer 4

添加到Marcel Jacques Machado's answer：

Predicate<Integer> isArt = (i) -> i <= 4;

实施谓词​​将如下：

if (isArt.test())  { .... .... }