Java中泛型接口实现字符相连

通过数组或者集合的形式传入泛型数据，然后用特定字符串隔开。

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

interface ElemmentJoiner{
public <T> String join(T[] ts,String delimiter);
public <T> String join(Collection<T> ts,String delimiter);
}
class tj implements ElemmentJoiner{
public <T> String join(T[] ts,String delimiter){
String x="";
for (int i = 0; i < ts.length; i++) {
x+=ts[i].toString()+delimiter;
}
int k=delimiter.length();
x=x.substring(0, x.length()-k);
return x;
}
public <T> String join (Collection<T> ts,String delimiter){
String x="";
Iterator<T> iter= ts.iterator();
while(iter.hasNext()){

x+=iter.next().toString()+delimiter;

}
int k=delimiter.length();
x=x.substring(0, x.length()-k);
return x;
}


}
public class collectionTest {
public static void main(String[] args){
tj tj=new tj();
Collection<String> ts=new ArrayList<String>();
ts.add("a");
ts.add("s2");
ts.add("3l");
System.out.println(tj.join(ts, "||"));
System.out.println(tj.join(new Integer[]{1,2,3}, "|"));
}
}

其中集合是通过迭代器的方式遍历。