标签：构造函数 text double nts 方法 out obj float tco
Integer[] nums = { 23, 16, 12, 58, 11 };
// 集合转换为数组
List<Integer> numList = Arrays.asList(nums);
Collections.sort(numList);
// 排序之后
for (Integer num : numList) {
System.out.print(num + "\t");
}
Integer[] nums = { 23, 16, 12, 58, 11 };
List<Integer> numList = Arrays.asList(nums);
// 内部类排序——Comparator
final boolean mark = false;
Collections.sort(numList, new Comparator<Integer>() {
@Override
public int compare(Integer o1, Integer o2) {
return mark ? o1 - o2 : o2 - o1;
}
});
// 排序之后
for (Integer j : numList) {
System.out.print(j + "\t");
}
import java.util.Comparator; public class ObjectComparator implements Comparator { private boolean mark = true; private double radix= 2; //构造函数，set getter public ObjectComparator(boolean mark) { this.mark = mark; } public ObjectComparator(boolean mark,double radix) { this.mark = mark; this.radix = radix; } @Override public int compare(Object o1, Object o2) { if(o1 instanceof Integer) { Integer a=(Integer) o1; Integer b=(Integer) o2; return mark?a-b:b-a; }else if(o1 instanceof Float) { int a=(int) (Float.parseFloat(String.valueOf(o1))*Math.pow(10,radix)); int b=(int) (Float.parseFloat(String.valueOf(o2))*Math.pow(10,radix)); return mark?a-b:b-a; }else if(o1 instanceof Double) { int a=(int) (Double.parseDouble(String.valueOf(o1))*Math.pow(10,radix)); int b=(int) (Double.parseDouble(String.valueOf(o2))*Math.pow(10,radix)); return mark?a-b:b-a; }else if(o1 instanceof Character){ Character ca = (Character)o1; Character cb = (Character)o2; int a = (int)ca; int b = (int)cb; return mark?a-b:b-a; } return 0; } }
import java.util.Comparator; import java.util.Date; public class DateComparator implements Comparator<Date> { private boolean flag; public DateComparator() { flag = true; } public DateComparator(boolean flag) { this.flag = flag; } @Override public int compare(Date o1, Date o2) { if (this.flag) { if (o2.before(o1)) {// 晚于 return -1; } else { return 1; } } else { if (o2.after(o1)) {// 晚于 return -1; } else { return 1; } } } }
标签：构造函数 text double nts 方法 out obj float tco
原文地址：http://www.cnblogs.com/sunnytest/p/6668155.html
