blocking request 包含 Java 中的()方法，示例
原文:https://www . geesforgeks . org/blocking reque-contains-method-in-Java-with-examples/
包含阻塞请求的(对象 o) 方法，检查参数中传递的元素是否存在于容器中。如果元素存在于容器中，则返回 true，否则返回 false 值。
语法:
public boolean contains(Object o)
参数:该方法接受一个强制参数 o ，其在容器中的存在将在容器中被检查。
返回:如果元素存在，这个方法返回真，否则返回假。
注:阻塞请求的 contains()方法是从 Java 中的linkedblockingdek类继承而来的。
下面的程序说明了包含()方法的阻塞请求:
程序 1:
// Java Program Demonstrate contains()
// method of BlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of BlockingDeque
BlockingDeque<Integer> BD
= new LinkedBlockingDeque<Integer>();
// Add numbers to end of BlockingDeque
BD.add(10);
BD.add(20);
BD.add(30);
BD.add(40);
// before removing print Deque
System.out.println("Blocking Deque: " + BD);
// check for presence using function
if (BD.contains(10)) {
System.out.println("Blocking Deque contains 10");
}
else {
System.out.println("Blocking Deque does not contain 10");
}
}
}
输出:
Blocking Deque: [10, 20, 30, 40]
Blocking Deque contains 10
程序二:
// Java Program Demonstrate contains()
// method of BlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of BlockingDeque
BlockingDeque<String> BD
= new LinkedBlockingDeque<String>();
// Add numbers to end of BlockingDeque
BD.add("ab");
BD.add("cd");
BD.add("fg");
BD.add("xz");
// before removing print Deque
System.out.println("Blocking Deque: " + BD);
// check for presence using function
if (BD.contains("go")) {
System.out.println("Blocking Deque contains 'go'");
}
else {
System.out.println("Blocking Deque does not contain 'go'");
}
}
}
输出:
Blocking Deque: [ab, cd, fg, xz]
Blocking Deque does not contain 'go'
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