我没看过 其他语言版的数据结构,但觉得Java的实现方法很巧妙--用类和对象来实现.基于数组的表,思想很简单就是定义一个类用来存储一组数据,我定义的是ArrayListClass类,在类中定义用来操作数组的方法.其实就是 这么简单,但具体操作起来就会碰到很多麻烦了!
我们这个ArrayListClass类中首先应该包括一个数组型的域list,用来存放数据,这样放在同一数组中数据之间就产生了位置上的联系,使对数据的操作便的简单.然而这个数组到底是什么数据类型的,我们期望这个表能用于所有的数据类型,我们不能将他单纯的固定成某一种.所以我们必须将这个数据普通化,解决的办法就是定义一个类,作为所有数据类型的超类.看这个DataElement:
public abstract class DataElement {
public abstract boolean equals(DataElement otherElement);
public abstract int compareTo(DataElement otherElement);
public abstract void makeCopy(DataElement otherElement);
public abstract DataElement getCopy();
}
将他定义成为抽象的,再在定义其他数据类型时继续并实现它,我定义了两个数据类型IntElement和StringElement:
IntElement:
public class IntElement extends DataElement {
protected int num;
//constrUCtors
public IntElement(){
num=0;
}
public IntElement(int number){
num=number;
}
public IntElement(IntElement otherElement){
num=otherElement.num;
}
///get-set Methods
public void setNum(int number){
num=number;
}
public int getNum(){
return num;
}
/* (non-Javadoc)
* @see DataElement#equals(DataElement)
*/
public boolean equals(DataElement otherElement) {
// TODO Auto-generated method stub
IntElement newe=(IntElement)otherElement;
return (this.num==newe.num);
}
/* (non-Javadoc)
* @see DataElement#compareTo(DataElement)
*/
public int compareTo(DataElement otherElement) {
// TODO Auto-generated method stub
IntElement newe=(IntElement)otherElement;
if(this.num==newe.num)
return 0;
else if(this.num>newe.num)
return 1;
else
return -1;
}
/* (non-Javadoc)
* @see DataElement#makeCopy(DataElement)
*/
public void makeCopy(DataElement otherElement) {
// TODO Auto-generated method stub
IntElement newe=(IntElement)otherElement;
this.num=newe.num;
}
/* (non-Javadoc)
* @see DataElement#getCopy()
*/
public DataElement getCopy() {
// TODO Auto-generated method stub
IntElement newElement=new IntElement();
newElement.num=this.num;
return newElement;
}
public String toString(){
return String.valueOf(num);
}
}
StringElement:
public class StringElement extends DataElement {
/**
*
*/
private String str;
//constructors
public StringElement() {
str=null;
}
public StringElement(String string){
str=string;
}
public StringElement(StringElement otherElement){
str=otherElement.str;
}
//get-set Methods
public void setStr(String string){
str=string;
}
public String getStr(){
return str;
}
/* (non-Javadoc)
* @see DataElement#equals(DataElement)
*/
public boolean equals(DataElement otherElement) {
// TODO Auto-generated method stub
StringElement newe=(StringElement)otherElement;
return (str==newe.str);
}
/* (non-Javadoc)
* @see DataElement#compareTo(DataElement)
*/
public int compareTo(DataElement otherElement) {
// TODO Auto-generated method stub
StringElement newe=(StringElement)otherElement;
