1:二分查找法

public class Test {

	public static void main(String[] args) {
	  
		int []a ={1,2,5,7,8,12,14};
		System.out.println(print(a, 8));
	}
	
	public static int print(int[] a,int num){
		int start =0;
		int end=a.length-1;
		int mid=-1;
		
		while(start<=end){
			mid=(start+end)/2;
			if(a[mid]==num){
				return mid;
			}else if (a[mid]<num) {
				start=mid+1;
			}else if (a[mid]>mid) {
				end=mid-1;
			}
		}
		
		return -1;
	}

}

2：链表的算法实现

public class Test {

	public static void main(String[] args) {
		MassageNode massageNode=new MassageNode();
		massageNode.add(1);
		massageNode.add(2);
		massageNode.add(3);
		massageNode.add(4);
		massageNode.add(5);
		massageNode.add(6);
		System.out.println(massageNode.delect(5));
		massageNode.finAll();

	}

}

class MassageNode{
	private Node rootNode;
	public void add(int date){
		if(rootNode==null){
			rootNode=new Node(date);
		}else{
			rootNode.add(date);
		}
	}
	
	public boolean delect(int date){
		if(rootNode!=null){
			if (rootNode.getDate()==date) {
				rootNode=rootNode.nextNode;
				return true;
			}else {
				return rootNode.delect(date);
			}
		}
		return false;
		
	}
	
    public void finAll(){
    	if(rootNode!=null){
    		System.out.println(rootNode.date);
    		rootNode.finAll();
		}else{
			return;	
		}
		
	}
	
	private class Node{
		private int date;
		private Node nextNode;
		public Node() {
			super();
			// TODO Auto-generated constructor stub
		}

		public Node(int date) {
			super();
			this.date = date;
		}

		public int getDate() {
			return date;
		}

		public void setDate(int date) {
			this.date = date;
		}
		
		public void add(int date){
			if(this.nextNode==null){
				this.nextNode=new Node(date);
			}else{
				this.nextNode.add(date);
			}
		}
		
		public boolean delect(int date){
			if(this.nextNode!=null){
				if (this.nextNode.getDate()==date) {
					this.nextNode=this.nextNode.nextNode;
					return true;
				}else {
					return this.nextNode.delect(date);
				}
			}
			return false;
		}
		
		public void finAll(){
			if(this.nextNode!=null){
				System.out.println(this.nextNode.getDate());
				this.nextNode.finAll();
			}else{
				return;
			}
				
			
		}
	}
}