import java.util.arrays.sort
时间: 2023-12-26 07:05:07 浏览: 144
I'm sorry, but your code snippet is not complete and has errors. The correct syntax for importing the sort method from the Arrays class in Java is:
import java.util.Arrays;
And to use the sort method, you would call it on an array like this:
int[] arr = {3, 1, 4, 1, 5, 9, 2, 6, 5, 3};
Arrays.sort(arr);
This would sort the array in ascending order, and the resulting array would be: [1, 1, 2, 3, 3, 4, 5, 5, 6, 9].
相关问题
使用import java.text.SimpleDateFormat; import java.util.Arrays; import java.util.Date;插入排序49, 38, 65, 97, 76, 13, 27, 101, 34, 119, 1(从小到大)
以下是使用 Java 插入排序算法对给定数据进行排序的代码:
```java
public class InsertionSort {
public static void main(String[] args) {
int[] arr = {49, 38, 65, 97, 76, 13, 27, 101, 34, 119, 1};
System.out.println("排序前:" + Arrays.toString(arr));
insertionSort(arr);
System.out.println("排序后:" + Arrays.toString(arr));
}
public static void insertionSort(int[] arr) {
int n = arr.length;
for (int i = 1; i < n; i++) {
int key = arr[i];
int j = i - 1;
while (j >= 0 && arr[j] > key) {
arr[j + 1] = arr[j];
j--;
}
arr[j + 1] = key;
}
}
}
```
运行结果:
```
排序前:[49, 38, 65, 97, 76, 13, 27, 101, 34, 119, 1]
排序后:[1, 13, 27, 34, 38, 49, 65, 76, 97, 101, 119]
```
声明一个 Student 类,属性包括姓名、学号、总成绩;生成 10 个 Student 类对象,并放在一个一维数组中,编写方法按总成绩进行排序,将排序后的对象 分别保持在Vector 、ArrayList、 HashTable类型的对象中,并遍历显示其中 元素的信息。 程序设计参考框架如下: import java,util.Vector; import java.util.ArrayList; import java.util.Hashtable; import java.util.Enumeration; import java.util.Iterator; public class Ex71 { public static void main (String[] args){
public class Student implements Comparable<Student>{
private String name;
private int id;
private int totalScore;
public Student(String name, int id, int totalScore){
this.name = name;
this.id = id;
this.totalScore = totalScore;
}
public String getName(){
return name;
}
public int getId(){
return id;
}
public int getTotalScore(){
return totalScore;
}
public void setName(String name){
this.name = name;
}
public void setId(int id){
this.id = id;
}
public void setTotalScore(int totalScore){
this.totalScore = totalScore;
}
public int compareTo(Student s){
return this.totalScore - s.totalScore;
}
}
import java.util.Vector;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Enumeration;
import java.util.Iterator;
public class Ex71 {
public static void main (String[] args){
Student[] students = new Student[10];
students[0] = new Student("Tom", 1001, 80);
students[1] = new Student("Jerry", 1002, 90);
students[2] = new Student("Alice", 1003, 85);
students[3] = new Student("Bob", 1004, 70);
students[4] = new Student("Peter", 1005, 95);
students[5] = new Student("Mary", 1006, 65);
students[6] = new Student("John", 1007, 75);
students[7] = new Student("Lucy", 1008, 88);
students[8] = new Student("David", 1009, 92);
students[9] = new Student("Lily", 1010, 78);
// sort by total score
Arrays.sort(students);
// put sorted objects into Vector
Vector<Student> vector = new Vector<Student>();
for(Student s : students){
vector.add(s);
}
// put sorted objects into ArrayList
ArrayList<Student> arrayList = new ArrayList<Student>();
for(Student s : students){
arrayList.add(s);
}
// put sorted objects into Hashtable
Hashtable<Integer, Student> hashtable = new Hashtable<Integer, Student>();
int i = 1;
for(Student s : students){
hashtable.put(i++, s);
}
// display elements in Vector
System.out.println("Elements in Vector:");
Enumeration<Student> enumeration = vector.elements();
while(enumeration.hasMoreElements()){
Student s = enumeration.nextElement();
System.out.println("Name: " + s.getName() + ", ID: " + s.getId() + ", Total Score: " + s.getTotalScore());
}
// display elements in ArrayList
System.out.println("Elements in ArrayList:");
Iterator<Student> iterator = arrayList.iterator();
while(iterator.hasNext()){
Student s = iterator.next();
System.out.println("Name: " + s.getName() + ", ID: " + s.getId() + ", Total Score: " + s.getTotalScore());
}
// display elements in Hashtable
System.out.println("Elements in Hashtable:");
Enumeration<Integer> keys = hashtable.keys();
while(keys.hasMoreElements()){
Integer key = keys.nextElement();
Student s = hashtable.get(key);
System.out.println("Name: " + s.getName() + ", ID: " + s.getId() + ", Total Score: " + s.getTotalScore());
}
}
}
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