利用基本数组类型搭建可自扩展的数组类
2008-01-05 10:54:07 来源:WEB开发网核心提示:public class ChenqiArray {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubRisingsoftArray raOne=new RisingsoftArray(
public class ChenqiArray {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
RisingsoftArray raOne=new RisingsoftArray();
int newLength=raOne.getArrayCount()+10;
for(int i=0;i<newLength;i++){
raOne.setItem(i,new Integer(i));
System.out.PRintln("raOne.items["+i+"]="+raOne.getItem(i));
}
newLength=raOne.getArrayCount()+5;
for(int i=0;i<newLength;i++){
raOne.setItem(i,new Integer(i));
System.out.println("raOne.items["+i+"]="+raOne.getItem(i));
}
newLength=raOne.getArrayCount()+5;
raOne.setItem(newLength-1,new Integer(newLength-1));
for(int i=0;i<raOne.getArrayCount();i++){
System.out.println("raOne.items["+i+"]="+raOne.getItem(i));
}
}
}
class RisingsoftArray{
private Object[] obj;
//constrUCtor
public RisingsoftArray(int ArrayLength){
if(ArrayLength>=1){
obj=new Object[ArrayLength];
}
}
public RisingsoftArray(){
this(0);
}
public RisingsoftArray(Object[] obj){
this.obj=RisingsoftArray.cloneArray(obj);
}
//get the Array items count
public int getArrayCount(){
return (obj!=null)?obj.length:0;
}
//auto eXPand the Array and copy the items
public void expandArray(int n){
if(n>0 && n>getArrayCount()){
Object[] newObj=new Object[n];
for(int i=0;i<getArrayCount();newObj[i]=obj[i++]){}
obj=newObj;
}
}
//get access
public Object getItem(int pos){
return (pos>=0 && pos<getArrayCount())?obj[pos]:null;
}
//set access
public void setItem(int pos,Object obj){
if(pos>=0 && pos<getArrayCount()){
this.obj[pos]=obj;
}
else if (pos>0(pos==getArrayCount())) {
expandArray(pos+1);
setItem(pos,obj);
}
}
//clone a Array
public static Object[] cloneArray(Object[] obj){
if(obj.length<1){
return null;
}
else{
Object[] newObj=new Object[obj.length];
for(int i=0;i<obj.length;newObj[i]=obj[i++]){}
return newObj;
}
}
}
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