算法学习---对象类型的数组二分查找实现

public class Person {
	private String firstName;
	private String lastName;
	private int age;

	public Person(String firstName, String lastName, int age) {
		super();
		this.firstName = firstName;
		this.lastName = lastName;
		this.age = age;
	}

	public String getFirstName() {
		return firstName;
	}

	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}

	public String getLastName() {
		return lastName;
	}

	public void setLastName(String lastName) {
		this.lastName = lastName;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	@Override
	public String toString() {
		return "Person [firstName=" + firstName + ", lastName=" + lastName
				+ ", age=" + age + "]";
	}
	
	
}

public class ClassDataArray {
   private Person[] a;
   private int size;
   
   public ClassDataArray(int max){
	   a = new Person[max];
	   size = 0;
   }
   
   public Person find(String searchLastName){
	   int i;
	   for(i=0;i<size;i++){
		   if(a[i]!= null && searchLastName.equals(a[i].getLastName())){
			   return a[i];
		   }
	   }
		return null;
   }
   
   public void insert(Person person){
	   a[size] = person;
	   size++;
   }
   
   public boolean delete(String searchLastName){
	   int j;
	   for(j=0;j<size;j++)
		   if(searchLastName.equals(a[j].getLastName()))
			   break;
	   if(j==size)
		   return false;
	   else{
		   for(int k=j;k<size;k++)
		    a[k] = a[k+1];
		    size--;
		    return true;
	   }
   }
   
   public void display(){
	   for(int i=0;i<size;i++){
		   System.out.println(a[i]);
	   }
   }
   
}

客户端

public class Clinet {
    public static void main(String[] args) {
	  ClassDataArray array = new ClassDataArray(100);
	  Person zhangsan = new Person("zhang", "san", 21);
	  Person lisi = new Person("li", "si", 22);
	  Person wangwu = new Person("wang", "wu", 13);
	  Person lily = new Person("li", "ly", 56);
	  Person rex = new Person("rex", "", 21);
	  Person json = new Person("ja", "son", 23);
	  Person mike = new Person("mi", "kel", 66);
	  Person cloud = new Person("clou", "der", 19);
	  array.insert(zhangsan);
	  array.insert(lisi);
	  array.insert(wangwu);
	  array.insert(lily);
	  array.insert(rex);
	  array.insert(json);
	  array.insert(mike);
	  array.insert(cloud);
	  array.display();
	  findPerson(array, "san");
	  findPerson(array, "kris");
	  array.delete("");
	  array.delete("ly");
	  array.delete("wu");
	  array.delete("si");
	  array.display();
    }

	private static void findPerson(ClassDataArray array, String searchName) {
		if(array.find(searchName)!=null){
			  System.out.println("find "+ searchName);;
		  } else{
			  System.out.println("can't find "+searchName);
		  }
	}

}