public
MetaCell[][] getByColumn(
final
int
columnIndex,
int
decisionIndex) {
//
【注意】final咯
MetaCell[][] array =
new
MetaCell[m][2];
//
Entry<MetaCell, MetaCell>参考http:
//
blog.csdn.net/sunmenggmail/article/details/8952712 和
http://www.cnblogs.com/fstang/archive/2013/04/20/3032097.html
for
(
int
i=0; i<m; i++){
array[i][0]=A[i][columnIndex];
array[i][1]=A[i][decisionIndex];
}
Arrays.sort(array,
new
Comparator<MetaCell[]>(){
//
二维数组按照某列进行排序,你也可以采用Map
public
int
compare(MetaCell[] o1, MetaCell[] o2) {
//
任何多维数组可看成一个一维数组,一维数组中每个元素是一个一维数组
return
o1[columnIndex].compareTo(o2[columnIndex]);
//
比较:大于0则表示升序
}
} );
return
array;
}
import
java.util.Comparator;
public
class
ArraySort {
public
static
void
sort(
int
[][] ob,
final
int
[] order) {
Arrays.sort(ob,
new
Comparator<Object>() {
public
int
compare(Object o1, Object o2) {
int
[] one = (
int
[]) o1;
int
[] two = (
int
[]) o2;
for
(
int
i = 0; i < order.length; i++) {
int
k = order[i];
if
(one[k] > two[k]) {
return
1;
}
else
if
(one[k] < two[k]) {
return
-1;
}
else
{
continue
;
//
如果按一条件比较结果相等,就使用第二个条件进行比较。
}
}
return
0;
}
});
}
public
static
void
main(String[] args) {
int
array[][] =
new
int
[][] {
{ 12, 34, 68, 32, 9, 12, 545 },
{ 34, 72, 82, 57, 56, 0, 213 },
{ 12, 34, 68, 32, 21, 945, 23 },
{ 91, 10, 3, 2354, 73, 34, 18 },
{ 12, 83, 189, 26, 27, 98, 33 },
{ 47, 23, 889, 24, 899, 23, 657 },
{ 12, 34, 68, 343, 878, 235, 768 },
{ 12, 34, 98, 56, 78, 12, 546 },
{ 26, 78, 2365, 78, 34, 256, 873 } };
sort(array,
new
int
[] {0,1});
//
先根据第一列比较,若相同则再比较第二列
for
(
int
i = 0; i < array.length; i++) {
for
(
int
j = 0; j < array[i].length; j++) {
System.out.print(array[i][j]);
System.out.print("\t");
}
System.out.println();
}
}
}