Java 中的 Java . util . function . double predicate 接口，带示例
原文:https://www . geesforgeks . org/Java-util-function-double predicate-interface-in-Java-with-examples/
双谓词接口在 JDK 8 中引入。该接口封装在 java.util.function 包中。它对 Double 对象进行操作，并根据条件返回谓词值。这是一个功能界面，因此也可以用于λ表达式。
public interface DoublePredicate
方法T2】
- test() :该函数对双精度值进行条件检查，并返回一个表示结果的布尔值。
boolean test(double value)
- 和():此函数对当前对象和作为参数接收的对象应用 and 运算，并返回新形成的谓词。此方法有默认实现。
default DoublePredicate and(DoublePredicate other)
- 求反():此函数返回当前谓词的逆，即反转测试条件。此方法有默认实现。
default DoublePredicate negate()
- 或():此函数对当前对象和作为参数接收的对象应用 or 运算，并返回新形成的谓词。此方法有默认实现。
default DoublePredicate or(DoublePredicate other)
示例:
Java 语言(一种计算机语言，尤用于创建网站)
// Java example to demonstrate DoublePredicate interface
import java.util.function.DoublePredicate;
public class DoublePredicateDemo {
public static void main(String[] args)
{
// DoublePredicate to check square
// of x is less than 100
DoublePredicate db
= (x) -> { return x * x < 100.0; };
System.out.println("100 is less than 100 "
+ db.test(10));
DoublePredicate db3;
// Test condition reversed
db.negate();
System.out.println("100 is greater than 100 "
+ db.test(10));
DoublePredicate db2 = (x) ->
{
double y = x * x;
return y >= 36 && y < 1000;
};
// Test condition ANDed
// with another predicate
db3 = db.and(db2);
System.out.println("81 is less than 100 "
+ db3.test(9));
db3 = db.or(db2);
// Test condition ORed with another predicate
System.out.println("49 is greater than 36"
+ " and less than 100 "
+ db3.test(7));
}
}
Output:
100 is less than 100 false
100 is greater than 100 false
81 is less than 100 true
49 is greater than 36 and less than 100 true
参考:T2T4】
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