Commitad02b19

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Queue

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	`1`	`+importjava.util.*;`
	`2`	`+`
	`3`	`+classQueueDemo {`
	`4`	`+`
	`5`	`+publicstaticvoidmain(String[]args) {`
	`6`	`+`
	`7`	`+Queueque =newLinkedList();`
	`8`	`+`
	`9`	`+que.offer(10);`
	`10`	`+que.offer(20);`
	`11`	`+que.offer(50);`
	`12`	`+que.offer(30);`
	`13`	`+que.offer(40);`
	`14`	`+`
	`15`	`+System.out.println(que);`
	`16`	`+`
	`17`	`+// 1) peek();`
	`18`	`+System.out.println(que.peek());`
	`19`	`+`
	`20`	`+// 2) element();`
	`21`	`+System.out.println(que.element());// throws NoSuchElementException`
	`22`	`+`
	`23`	`+// 3) poll();`
	`24`	`+que.poll();`
	`25`	`+System.out.println(que);`
	`26`	`+`
	`27`	`+// 4) remove()`
	`28`	`+que.remove();`
	`29`	`+System.out.println(que);// throws NoSuchElementException`
	`30`	`+}`
	`31`	`+}`

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