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java降序源代码,JAVA降序排序
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这个java代码，如何降序排列，代码如何编写呢？
用Arrays类sort()对数组元素进行降序排列：
import java.util.Arrays;
class SortDemo
{
public static void main(String[] args)
{
int[] vec={65,70,-77,85,98};
Arrays.sort(vec);
System.out.println("/n");
System.out.println("降序排列：");
for (int i=vec.length-1;i=0 ;i-- )
{
System.out.print(vec[i]+" ");
}
}
}
相关问答
Q1: java里升序和降序最简短的代码分别是什么？
直接调用jdk里面的方法Arrays.sort(args)方法。而且这个方法重载实现了多个参数，排序下标[N~M]位数字~倒叙，升序等等~
for (int i = 0; i list.size(); i++) {
for (int j = i + 1; j list.size(); j++) {
if (list.get(i) list.get(j)) {
int temp = list.get(i);
list.set(i, list.get(j));
list.set(j, temp);
}
}
}
System.out.println("升序：" + list);
for (int i = 0; i list.size(); i++) {
for (int j = i + 1; j list.size(); j++) {
if (list.get(i) list.get(j)) {
int temp = list.get(i);
list.set(i, list.get(j));
list.set(j, temp);
}
}
}
System.out.println("降序：" + list);
Q2: Java升序降序
import java.util.*;
public class Test {
public static void main(String[] args) {
int stuNum = 4;
int classNum = 3;
double[] score = new double[stuNum];
double sum = 0;
double[] avgrage = new double[classNum];
double[] arr = new double[classNum * stuNum];
Scanner input = new Scanner(System. in );
for (int i = 0; i classNum; i++) {
sum = 0;
System.out.println("请输入第" + (i + 1) + "个班级成绩：");
for (int j = 0; j score.length; j++) {
System.out.print("第" + (j + 1) + "个学员的成绩：");
double s = input.nextDouble();
score[j] = s;
sum += s;
arr[i * stuNum + j] = s;
}
avgrage[i] = sum / score.length;
System.out.println("第" + (i + 1) + "个班级参赛学员的平均分是：" + avgrage[i] + "\n");
}
input.close();
System.out.println("原序: " + Arrays.toString(arr));
//升序
for (int i = 0; i arr.length; i++) {
for (int j = i + 1; j arr.length; j++) {
if (arr[i] arr[j]) {
double tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
}
}
}
System.out.println("升序: " + Arrays.toString(arr));
//降序
for (int i = 0; i arr.length; i++) {
for (int j = i + 1; j arr.length; j++) {
if (arr[i] arr[j]) {
double tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
}
}
}
System.out.println("降序: " + Arrays.toString(arr));
}
}
Q3: JAVA语言里面数组的降序是怎样的，，求代码
public class Test {
/**
*冒泡降序
*/
public static int[] descSort(int[] param) {
int i, j;
int temp = 0;
for (j = 0; j param.length; j++) {
for (i = param.length - 1; i j; i--) {
if (param[i] param[i - 1]) {
temp = param[i];
param[i] = param[i - 1];
param[i - 1] = temp;
}
}
}
return param;
}
public static void main(String[] args) {
int[] param = { 1, 6, 7, 5 };
param = descSort(param);
for (int i = 0; i param.length; i++) {
System.out.print(param[i]);
}
}
}
Q4: java中,如何实现集合的升序和降序排列
单纯的字符串或者数字排列可用Collections.sort(object o)方法，这样方便。
如果是要对对象中的某一进行排序，则可实现Comparator接口，复写其中的Compare方法；然后调用Collections.sort(object 0 , Comparator c)方法;
说的只是思路，具体问题可以查看帮助文档。
