Question

怎么用java实现快速排序

怎么用java实现快速排序么么|｡･㉨･)っ♡　喜欢你♪

Answer 1

package com.xinhua.test2;
public class Student {
int sno;
String name;
double chiness;
double math;
double english;
double three_sco;
double all_s;
public Student(int sno, String name, double chiness, double math, double english, double three_sco) {
this.sno = sno;
this.name = name;
this.chiness = chiness;
this.math = math;
this.english = english;
this.three_sco = three_sco;
}
@Override
public String toString() {
return "学号：" + sno + ", 名字：" + name + ", 语文成绩：" + chiness + ", 数学成绩：" + math + ", 英语成绩："
+ english + "总成绩："+(chiness+math+english+three_sco);
}
public static void main(String[] args) {
Student A=new Student(1, "张三", 118, 145, 114.5, 198);
Student B=new Student(2, "李四", 130,110.5,100,210);
Student C=new Student(3, "王五",142.5,120,87.5,245.5);
System.out.println("学生列表信息为：");
System.out.println(A.toString());
System.out.println(B.toString());
System.out.println(C.toString());
//
double a_scoAll=A.chiness+A.math+A.english+A.three_sco;
A.all_s=a_scoAll;
double b_scoAll=B.chiness+B.math+B.english+B.three_sco;
B.all_s=b_scoAll;
double c_sclAll=C.chiness+C.math+C.english+C.three_sco;
C.all_s=c_sclAll;
Student[] s_s={A,B,C};
System.out.println("按总成绩从大到小排序为");
Student temp;
for(int i=0;i<s_s.length;i++){
for(int j=1;j<s_s.length-i;j++){
if(s_s[j-1].all_s < s_s[j].all_s){
temp=s_s[j-1] ;
s_s[j-1] =s_s[j];
s_s[j]=temp;
}
}
}
for(int i=0;i<s_s.length;i++){
System.out.println("第"+(i+1)+"名为："+s_s[i].toString());
}
}
}

Answer 2

Java中的常用有序容器中均封装了sort()方法，可以直接排序。数组可以用Arrays.sort()静态方法排序。sort内部通过优化过的快速排序实现。