存储对象的数组

类

public class Person {
	private String lastName;
	private String firstName;
	private int age;
	public Person(String last,String first,int a){
		lastName=last;
		firstName=first;
		age=a;
	}
	public void displayPerson(){
		System.out.print("Last name:"+lastName+",First name:"+firstName+",Age:"+age);
	}
	public String getLast(){
		return lastName;
	}
}

public class ClassDataArray {
	private Person[] a;
	private int nElems;
	public ClassDataArray(int max){
		a=new Person[max];
		nElems=0;
	}
	//按姓查询
	public Person find(String searchName){
		int i;
		for(i=0;i<nElems;i++){
			if(a[i].getLast().equals(searchName)) break;
		}
		if(i==nElems) return null;
		else return a[i];
	}
	public void insert(String last,String first,int age){
		a[nElems]=new Person(last, first, age);
		nElems++;
	}
	public boolean delete(String searchName){
		int i;
		for(i=0;i<nElems;i++)
			if(a[i].getLast().equals(searchName)) break;
		if(i==nElems) return false;
		else{
			for(int k=i;k<nElems;k++){
				a[k]=a[k+1];
			}
			nElems--;
			return true;
		}
	}
	public void displayA(){
		for(int i=0;i<nElems;i++)
			a[i].displayPerson();
	}
}

主程序

public class ClassDataApp {
	public static void main(String[] args){
		int maxSize=100;
		ClassDataArray array;
		array=new ClassDataArray(maxSize);
		array.insert("a", "a", 12);
		array.insert("b", "b", 32);
		array.insert("c", "c", 43);
		array.insert("d", "d", 13);
		array.insert("e", "e", 33);
		array.displayA();
		String seachKey="a";
		Person found;
		found=array.find(seachKey);
		if(found!=null){
			System.out.println("Found");
			found.displayPerson();
		}
		else{
			System.out.println("Can`t find "+seachKey);
		}
		System.out.println("Delete a and b");
		array.delete("a");
		array.delete("b");
		array.displayA();
	}
}