Java PriorityBlockingQueue toString()方法

PriorityBlockingQueue 的 toString() 方法返回该PriorityBlockingQueue的字符串表示，显示PriorityBlockingQueue所含元素的细节。PriorityBlockingQueue的字符串包含了PriorityBlockingQueue的元素，其顺序与迭代器返回的顺序相同，用方括号（”[]”）括起来。这些元素被字符”，”（逗号和空格）分开。所以基本上toString()方法是用来将PriorityBlockingQueue的所有元素转换成一个字符串。

语法

public String toString()

返回： 该方法返回一个 字符串 ，代表这个PriorityBlockingQueue的元素。

下面的程序说明了PriorityBlockingQueue的toString()方法。

例1： 演示PriorityBlockingQueue的toString()方法，其中包含一个整数列表。

// Java Program Demonstrate toString()
// method of PriorityBlockingQueue
 
import java.util.concurrent.PriorityBlockingQueue;
import java.util.*;
 
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
 
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<Integer> PrioQueue
            = new PriorityBlockingQueue<Integer>();
 
        // Add numbers to PriorityBlockingQueue
        PrioQueue.put(45815616);
        PrioQueue.put(4981561);
        PrioQueue.put(4594591);
        PrioQueue.put(9459156);
 
        // get String representation of PriorityBlockingQueue
        String str = PrioQueue.toString();
 
        // print Details
        System.out.println("String representation: " + str);
    }
}

输出

String representation: [4594591, 9459156, 4981561, 45815616]

例2： 在包含字符串列表的PriorityBlockingQueue上演示toString()方法

// Java Program Demonstrate toString()
// method of PriorityBlockingQueue
 
import java.util.concurrent.PriorityBlockingQueue;
import java.util.*;
 
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
 
        // create object of PriorityBlockingQueue
        // which contains Strings
        PriorityBlockingQueue<String> names
            = new PriorityBlockingQueue<String>();
 
        // Add Strings
        names.add("Geeks");
        names.add("forGeeks");
        names.add("A Computer Portal");
        names.add("By Sandeep Jain");
 
        // get String representation of PriorityBlockingQueue
        String str = names.toString();
 
        // print Details
        System.out.println("String representation: " + str);
    }
}

输出

String representation: [A Computer Portal, By Sandeep Jain, Geeks, forGeeks]

参考资料: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/PriorityBlockingQueue.html#toString-