BlockingQueue 包含 Java 中的()方法,并附有示例
原文:https://www . geesforgeks . org/blockingqueue-contains-method-in-Java-with-examples/
包含阻塞队列接口的(对象 o) 方法,检查参数中传递的元素在容器中是否存在。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:包含()封锁队列的方法继承了 Java 中的队列类。
下面的程序说明了包含()方法的阻塞队列:
程序 1:
// Java Program Demonstrate contains()
// method of BlockingQueue
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of BlockingQueue
BlockingQueue<Integer> BQ
= new LinkedBlockingQueue<Integer>();
// Add numbers to end of BlockingQueue
BQ.add(10);
BQ.add(20);
BQ.add(30);
BQ.add(40);
// before removing print queue
System.out.println("Blocking Queue: " + BQ);
// check for presence using function
if (BQ.contains(10)) {
System.out.println("Blocking Queue contains 10");
}
else {
System.out.println("Blocking Queue does not contain 10");
}
}
}
输出:
Blocking Queue: [10, 20, 30, 40]
Blocking Queue contains 10
程序二:
// Java Program Demonstrate contains()
// method of BlockingQueue
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of BlockingQueue
BlockingQueue<String> BQ
= new LinkedBlockingQueue<String>();
// Add numbers to end of BlockingQueue
BQ.add("ab");
BQ.add("cd");
BQ.add("fg");
BQ.add("xz");
// before removing print queue
System.out.println("Blocking Queue: " + BQ);
// check for presence using function
if (BQ.contains("go")) {
System.out.println("Blocking Queue contains 'go'");
}
else {
System.out.println("Blocking Queue does not contain 'go'");
}
}
}
输出:
Blocking Queue: [ab, cd, fg, xz]
Blocking Queue does not contain 'go'
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