Java Stream - 如何创建谓词和调用和方法

import java.util.function.Predicate;

public class Main {

  public static void main(String[] args) {
    Predicate<String> a = (input) -> input.contains("a");
    Predicate<String> b = (input) -> input.contains("b");
    
    System.out.println("test ac:" + a.and(b).test("ac"));
    System.out.println("test bc:" + a.and(b).test("bc"));
    System.out.println("test ab:" + a.and(b).test("ab"));

  }

}