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java代码双向循环表 java双重循环输出图案
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java 双重循环
import java.util.ArrayList;
import java.util.List;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
ListString a1 = new ArrayListString();
a1.add("2");
a1.add("3");
a1.add("5");
a1.add("4");
a1.add("6");
a1.add("8");
ListString b1 = new ArrayListString();
b1.add("4");
b1.add("2");
b1.add("5");
b1.add("6");
b1.add("8");
ListString c1 = new ArrayListString();
if (a1.contains("2") b1.contains("2")) {
for (int j = 0; j a1.size(); j++)
c1.add(a1.get(j));
for (int x = 0; x b1.size(); x++)
c1.add(b1.get(x));
}
if (a1.contains("2") !b1.contains("2")) {
System.out.println("ERROR...");
}
if (!a1.contains("2")) {
for (int i = 0; i b1.size(); i++) {
for (int m = 0; m a1.size(); m++) {
if (b1.get(i).equals(a1.get(m))) {
c1.add(a1.get(m));
}
}
}
}
for (int k = 0; k c1.size(); k++)
System.out.println("c1[" + k + "]= " + c1.get(k));
}
}
在Java中如何实现双向链表?
双向链表:就是有双向指针,即双向的链域。\x0d\x0a链结点的结构:\x0d\x0a┌────┬────┬────────┐\x0d\x0a│ data │ next │ previous │\x0d\x0a└────┴────┴────────┘\x0d\x0a双向链表不必是双端链表(持有对最后一个链结点的引用),双端链表插入时是双向的。\x0d\x0a有两条链:一条从头到尾,一条从尾到头,删除遍历时也是双向的。\x0d\x0a/**\x0d\x0a * 双向链表\x0d\x0a */\x0d\x0apublic class DoublyLinkedList {\x0d\x0a private Link head; //首结点\x0d\x0a private Link rear; //尾部指针\x0d\x0a public DoublyLinkedList() { }\x0d\x0a public T peekHead() {\x0d\x0a if (head != null) {\x0d\x0a return head.data;\x0d\x0a }\x0d\x0a return null;\x0d\x0a }\x0d\x0a public boolean isEmpty() {\x0d\x0a return head == null;\x0d\x0a }\x0d\x0a public void insertFirst(T data) {// 插入 到 链头\x0d\x0a Link newLink = new Link(data);\x0d\x0a if (isEmpty()) {//为空时,第1次插入的新结点为尾结点\x0d\x0a rear = newLink;\x0d\x0a } else {\x0d\x0a head.previous = newLink; //旧头结点的上结点等于新结点\x0d\x0a }\x0d\x0a newLink.next = head; //新结点的下结点旧头结点\x0d\x0a head = newLink; //赋值后,头结点的下结点是旧头结点,上结点null\x0d\x0a }\x0d\x0a public void insertLast(T data) {//在链尾 插入\x0d\x0a Link newLink = new Link(data);\x0d\x0a if (isEmpty()) {\x0d\x0a head = newLink;\x0d\x0a } else {\x0d\x0a rear.next = newLink;\x0d\x0a }\x0d\x0a newLink.previous = rear;\x0d\x0a rear = newLink; //赋值后,尾结点的上结点是旧尾结点,下结点null\x0d\x0a }\x0d\x0a public T deleteHead() {//删除 链头\x0d\x0a if (isEmpty()) return null;\x0d\x0a Link temp = head;\x0d\x0a head = head.next; //变更首结点,为下一结点\x0d\x0a if (head != null) {\x0d\x0a head.previous = null;\x0d\x0a } else {\x0d\x0a rear = null;\x0d\x0a }\x0d\x0a return temp.data;\x0d\x0a }\x0d\x0a public T deleteRear() {//删除 链尾\x0d\x0a if (isEmpty()) return null;\x0d\x0a Link temp = rear;\x0d\x0a rear = rear.previous; //变更尾结点,为上一结点\x0d\x0a if (rear != null) {\x0d\x0a rear.next = null;\x0d\x0a } else {\x0d\x0a head = null;\x0d\x0a }\x0d\x0a return temp.data;\x0d\x0a }\x0d\x0a public T find(T t) {//从头到尾find\x0d\x0a if (isEmpty()) {\x0d\x0a return null;\x0d\x0a }\x0d\x0a Link find = head;\x0d\x0a while (find != null) {\x0d\x0a if (!find.data.equals(t)) {\x0d\x0a find = find.next;\x0d\x0a } else {\x0d\x0a break;\x0d\x0a }\x0d\x0a }\x0d\x0a if (find == null) {\x0d\x0a return null;\x0d\x0a }\x0d\x0a return find.data;\x0d\x0a }\x0d\x0a public T delete(T t) {\x0d\x0a if (isEmpty()) {\x0d\x0a return null;\x0d\x0a }\x0d\x0a Link current = head;\x0d\x0a while (!current.data.equals(t)) {\x0d\x0a current = current.next;\x0d\x0a if (current == null) {\x0d\x0a return null;\x0d\x0a }\x0d\x0a }\x0d\x0a if (current == head) {\x0d\x0a head = head.next;\x0d\x0a if (head != null) {\x0d\x0a head.previous = null;\x0d\x0a }\x0d\x0a } else if (current == rear) {\x0d\x0a rear = rear.previous;\x0d\x0a if (rear != null) {\x0d\x0a rear.next = null;\x0d\x0a }\x0d\x0a } else {\x0d\x0a //中间的非两端的结点,要移除current\x0d\x0a current.next.previous = current.previous;\x0d\x0a current.previous.next = current.next;\x0d\x0a }\x0d\x0a return current.data;\x0d\x0a }\x0d\x0a public boolean insertAfter(T key, T data) {//插入在key之后, key不存在return false\x0d\x0a if (isEmpty()) {\x0d\x0a return false;\x0d\x0a }\x0d\x0a Link current = head;\x0d\x0a while (!current.data.equals(key)) {\x0d\x0a current = current.next;\x0d\x0a if (current == null) {\x0d\x0a return false;\x0d\x0a }\x0d\x0a }\x0d\x0a Link newLink = new Link(data);\x0d\x0a if (current == rear) {\x0d\x0a rear = newLink;\x0d\x0a } else {\x0d\x0a newLink.next = current.next;\x0d\x0a current.next.previous = newLink;\x0d\x0a }\x0d\x0a current.next = newLink;\x0d\x0a newLink.previous = current;\x0d\x0a return true;\x0d\x0a }\x0d\x0a public void displayList4Head() {//从头开始遍历\x0d\x0a System.out.println("List (first--last):");\x0d\x0a Link current = head;\x0d\x0a while (current != null) {\x0d\x0a current.displayLink();\x0d\x0a current = current.next;\x0d\x0a }\x0d\x0a }\x0d\x0a public void displayList4Rear() {//从尾开始遍历\x0d\x0a System.out.println("List (last--first):");\x0d\x0a Link current = rear;\x0d\x0a while (current != null) {\x0d\x0a current.displayLink();\x0d\x0a current = current.previous;\x0d\x0a }\x0d\x0a }\x0d\x0a\x0d\x0a class Link {//链结点\x0d\x0a T data; //数据域\x0d\x0a Link next; //后继指针,结点 链域\x0d\x0a Link previous; //前驱指针,结点 链域\x0d\x0a Link(T data) {\x0d\x0a this.data = data;\x0d\x0a }\x0d\x0a void displayLink() {\x0d\x0a System.out.println("the data is " + data.toString());\x0d\x0a }\x0d\x0a }\x0d\x0a public static void main(String[] args) {\x0d\x0a DoublyLinkedList list = new DoublyLinkedList();\x0d\x0a list.insertLast(1);\x0d\x0a list.insertFirst(2);\x0d\x0a list.insertLast(3);\x0d\x0a list.insertFirst(4);\x0d\x0a list.insertLast(5);\x0d\x0a list.displayList4Head();\x0d\x0a Integer deleteHead = list.deleteHead();\x0d\x0a System.out.println("deleteHead:" + deleteHead);\x0d\x0a list.displayList4Head();\x0d\x0a Integer deleteRear = list.deleteRear();\x0d\x0a System.out.println("deleteRear:" + deleteRear);\x0d\x0a list.displayList4Rear();\x0d\x0a System.out.println("find:" + list.find(6));\x0d\x0a System.out.println("find:" + list.find(3));\x0d\x0a System.out.println("delete find:" + list.delete(6));\x0d\x0a System.out.println("delete find:" + list.delete(1));\x0d\x0a list.displayList4Head();\x0d\x0a System.out.println("----在指定key后插入----");\x0d\x0a list.insertAfter(2, 8);\x0d\x0a list.insertAfter(2, 9);\x0d\x0a list.insertAfter(9, 10);\x0d\x0a list.displayList4Head();\x0d\x0a }\x0d\x0a}
如何使用java二重循环实现一下表格
k=1;
for(int i = 1; i=5;i++){
for(int j=5;j0;j--){
if(j=i){
System.out.print(k++);
if(j!=1){
System.out.print(",");
}
}else{
System.out.print(" ");
}
}
System.out.println();
k=1;
}
楼主可以直接运行一下试试,我这是直接写的,没有运行,不过我觉得应该是对的。。
帮忙写个java代码,双向循环链表操作的实现
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循环链表
java
java 中的LinkedList 是双向循环列表吗?
源代码中:
public void addLast(E e) {
addBefore(e, header);
}
将指定元素添加到此列表的结尾
public boolean add(E e) {
addBefore(e, header);
return true;
}
所以,add是向列表尾加的
看了一下addBefore方法
应该是双链表结构 不是循环双链表
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