第一行代码 之 第二篇代码笔记

class link{private class node1{private String data;private node1 next;public node1(String data){this.data = data;}public void addnode(node1 newnode){if (this.next == null){this.next = newnode;}else  {this.next.addnode(newnode);}}public String getnode(int index){if (link.this.foot ++ == index){return this.data;}else {return this.next.getnode(index);}}public void setnode(int index,String  data){if (link.this.foot ++ ==index){this.data= data;}else { this.next.setnode(index, data);}}public boolean containsnode(String data){if (data.equals(this.data)){return true;}else {if (this.next != null){return this.next.containsnode(data);}else {return false;}}}public void removenode(node1 previous,String data){if (data.equals(this.data)){previous.next = this.next;}else {this.next.removenode(this,data);}}public void printnode(){System.out.println(this.data);if (this.next != null){this.next.printnode();}}}// =====================================================private int foot =0;private int count =0;private node1 root;public void add(String data){node1 newnode = new node1(data);if (this.root == null){this.root = newnode;}else {this.root.addnode(newnode);}this.count ++;}public String get(int index){if (index > this.count -1){return null;}this.foot = 0;return this.root.getnode(index);}public void set(int index , String data){if (index > this.count -1){return;}this.foot = 0;this.root.setnode(index, data);}public boolean contains(String data){if (data == null || this.root == null){return false;}return this.root.containsnode(data);}public void remove(String data){if (this.contains(data)){if (data.equals(this.root.data)){this.root = this.root.next;}else {this.root.next.removenode(this.root,data);}}this.count --;}public void print(){if (this.root != null){this.root.printnode();}}}public class node{public static void main(String args[]){link lk = new link();lk.add("hello");lk.add("world");lk.add("like");lk.add("you");lk.print();System.out.println("============");System.out.println(lk.get(1));System.out.println(lk.get(1));System.out.println("============");lk.set(0,"Mr");lk.set(1,"hello");lk.print();System.out.println("============");lk.remove("like");lk.remove("hello");lk.print();}}