这个 删除（） 方法 队列接口 返回并删除容器前面的元素。它会删除容器的头部。该方法抛出了一个 非接触性异常 当队列为空时。
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语法：
E remove()
返回： 此方法返回 头 排队等候。
例外情况： 函数抛出一个 非接触性异常 当队列为空时。
下面的程序演示了队列的remove（）方法：
项目1： 借助于 链表 .
// Java Program Demonstrate remove() // method of Queue import java.util.*; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of Queue Queue<Integer> Q = new LinkedList<Integer>(); // Add numbers to end of Queue Q.add( 7855642 ); Q.add( 35658786 ); Q.add( 5278367 ); Q.add( 74381793 ); // print queue System.out.println( "Queue: " + Q); // print head and deletes the head System.out.println( "Queue's head: " + Q.remove()); // print head and deleted the head System.out.println( "Queue's head: " + Q.remove()); } } |
输出：
Queue: [7855642, 35658786, 5278367, 74381793] Queue's head: 7855642 Queue's head: 35658786
项目2： 借助于 ArrayDeque .
// Java Program Demonstrate remove() // method of Queue import java.util.*; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of Queue Queue<Integer> Q = new ArrayDeque<Integer>(); // Add numbers to end of Queue Q.add( 7855642 ); Q.add( 35658786 ); Q.add( 5278367 ); Q.add( 74381793 ); // print queue System.out.println( "Queue: " + Q); // print head and deletes the head System.out.println( "Queue's head: " + Q.remove()); // print head and deleted the head System.out.println( "Queue's head: " + Q.remove()); } } |
输出：
Queue: [7855642, 35658786, 5278367, 74381793] Queue's head: 7855642 Queue's head: 35658786
方案3： 借助于 LinkedBlockingDeque .
// Java Program Demonstrate remove() // method of Queue import java.util.*; import java.util.concurrent.LinkedBlockingDeque; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of Queue Queue<Integer> Q = new LinkedBlockingDeque<Integer>(); // Add numbers to end of Queue Q.add( 7855642 ); Q.add( 35658786 ); Q.add( 5278367 ); Q.add( 74381793 ); // print queue System.out.println( "Queue: " + Q); // print head and deletes the head System.out.println( "Queue's head: " + Q.remove()); // print head and deleted the head System.out.println( "Queue's head: " + Q.remove()); } } |
输出：
Queue: [7855642, 35658786, 5278367, 74381793] Queue's head: 7855642 Queue's head: 35658786
方案4： 借助于 ConcurrentLinkedEque .
// Java Program Demonstrate remove() // method of Queue import java.util.*; import java.util.concurrent.ConcurrentLinkedDeque; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of Queue Queue<Integer> Q = new ConcurrentLinkedDeque<Integer>(); // Add numbers to end of Queue Q.add( 7855642 ); Q.add( 35658786 ); Q.add( 5278367 ); Q.add( 74381793 ); // print queue System.out.println( "Queue: " + Q); // print head and deletes the head System.out.println( "Queue's head: " + Q.remove()); // print head and deleted the head System.out.println( "Queue's head: " + Q.remove()); } } |
输出：
Queue: [7855642, 35658786, 5278367, 74381793] Queue's head: 7855642 Queue's head: 35658786
下面的程序举例说明 此方法引发的异常 :
方案5： 展示 非接触性异常 .
// Java Program Demonstrate remove() // method of Queue import java.util.*; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of Queue Queue<Integer> Q = new LinkedList<Integer>(); // Add numbers to end of Queue Q.add( 423 ); Q.add( 3432 ); // print queue System.out.println( "Queue: " + Q); // print head and deletes the head System.out.println( "Queue's head: " + Q.remove()); // print head and deleted the head System.out.println( "Queue's head: " + Q.remove()); // print queue System.out.println( "Queue: " + Q); try { // Queue is empty now hence exception System.out.println( "Queue's head: " + Q.element()); } catch (Exception e) { System.out.println( "Exception: " + e); } } } |
输出：
Queue: [423, 3432] Queue's head: 423 Queue's head: 3432 Queue: [] Exception: java.util.NoSuchElementException
参考： https://docs.oracle.com/javase/8/docs/api/java/util/Queue.html#remove–
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