对一个List按某个字段进行降序排序
Collections.sort(arr, new Comparator<tu2>() {
public int compare(tu2 arg0, tu2 arg1) {
return arg0.getSummoney().compareTo(arg1.getSummoney());
}
});
现在已经实现升序排列 如何改成降序
Collections.sort(arr, new Comparator<tu2>() {
public int compare(tu2 arg0, tu2 arg1) {
return arg0.getSummoney().compareTo(arg1.getSummoney());
}
});
现在已经实现升序排列 如何改成降序
Collections.sort(arr, new Comparator <tu2>() {
public int compare(tu2 arg0, tu2 arg1) {
return arg1.getSummoney().compareTo(arg0.getSummoney());//2个参数换下位置
}
});