完整代码如下：
StringIntTuple.java：
public class StringIntTuple{
public final int intValue;
public final String stringValue;
public StringIntTuple(int intValue, String stringValue){
this.intValue = intValue;
this.stringValue = stringValue;
}
public String toString(){
return "(" + this.intValue + ", " + this.stringValue + ")";
}
}
StringIntTupleStringComparator.java：
import java.util.Comparator;
public class StringIntTupleStringComparator implements
Comparator<StringIntTuple> {
@Override
public int compare(StringIntTuple a, StringIntTuple b) {
// TODO Auto-generated method stub
return a.stringValue.compareTo(b.stringValue);
}
}
StringIntTupleIntComparator.java：
import java.util.Comparator;
public class StringIntTupleIntComparator implements Comparator<StringIntTuple> {
@Override
public int compare(StringIntTuple a,
StringIntTuple b) {
return ((Integer)a.intValue).compareTo((Integer)b.intValue);
}
}
Driver.java：
import java.util.ArrayList;
import java.util.Collections;
public class Driver {
/**
* @param args
*/
public static String[] names = new String[] {"Monkey1", "Dog2", "Horse3", "Cow4", "Spider5"};
public static int[] data = new int[] {1,2,3,4,5};
public static void main(String[] args) {
ArrayList<StringIntTuple> list = new ArrayList<StringIntTuple>();
for(int i =0; i<names.length; i++){
list.add(new StringIntTuple(data[i],names[i]));
}
Collections.sort(list, new StringIntTupleIntComparator());
System.out.println(list.toString());
Collections.sort(list, new StringIntTupleStringComparator());
System.out.println(list.toString());
}
}
输出（先按 int 字段排序，再按 String 字段排序）：
[(1, Monkey1), (2, Dog2), (3, Horse3), (4, Cow4), (5, Spider5)]
[(4, Cow4), (2, Dog2), (3, Horse3), (1, Monkey1), (5, Spider5)]
编辑 1（附加信息）：
如果你想让它适用于任何元组，即不将字段类型限制为 int、String，你可以简单地使用泛型执行相同的操作，即：
public class Tuple<A,B>{
public Tuple(A aValue, B bValue){
this.aValue = aValue;
this.bValue = bValue;
}
public final A aValue;
public final B bValue;
}
然后，只需相应地调整比较器，您就有了一个通用的解决方案。
编辑2（午餐后）：在这里。
public class TupleAComparator<A extends Comparable<A>,B extends Comparable<B>> implements Comparator<Tuple<A,B>> {
@Override
public int compare(Tuple<A, B> t1, Tuple<A, B> t2) {
return t1.aValue.compareTo(t2.aValue);
}
}
编辑 3：代码补充作为评论 #1 的答案（增加评论 #2）
TupleArrayList.java：
import java.util.ArrayList;
import java.util.List;
public class TupleArrayList<A,B> extends ArrayList<Tuple<A,B>> {
/**
* An ArrayList for tuples that can generate a List of tuples' elements from a specific position within each tuple
*/
private static final long serialVersionUID = -6931669375802967253L;
public List<A> GetAValues(){
ArrayList<A> aArr = new ArrayList<A>(this.size());
for(Tuple<A,B> tuple : this){
aArr.add(tuple.aValue);
}
return aArr;
}
public List<B> GetBValues(){
ArrayList<B> bArr = new ArrayList<B>(this.size());
for(Tuple<A,B> tuple : this){
bArr.add(tuple.bValue);
}
return bArr;
}
}