我有一个arraylist设置。我也设置了输入说明,以便用户可以输入一个字符串,然后输入一个整数,然后输入一个字符串(名字,年龄和姓氏)。
我需要按姓氏对arraylist进行排序。到目前为止,我输入的代码都在main方法下:
public static void main(String[] args) {
Name Name[] = new Name[50];
int count = 0;
for (int i=0; i<50; i++)
NewName[i] = new Name();
//ADD NEW TO ARRAYLIST NAME
String FName = JOptionPane.showInputDialog("first name");
int age = Integer.parseInt(JOptionPane.showInputDialog("age"));
String LName = JOptionPane.showInputDialog("last name");
NewName[count] = new Name(FName, age, LName);
count = count++;
}
//ITEMS SORT BY LAST NAME
//CODE FOR SORT GOES HERE
最佳答案
看看Comparable,Comparator,Arrays.sort和Collections.sort
import java.util.Arrays;
class Name implements Comparable<Name> {
private String lastName;
//Other fields
public Name(String lastName){
this.lastName = lastName;
}
public int compareTo(Name o) {
//Null checks etc
return lastName.compareTo(o.lastName);
}
public String getLastName(){
return lastName;
}
//Getter and setter methods
}
public class Test{
public static void main(String[] args) {
Name[] arr = new Name[]{new Name("AAC"), new Name("AAD"), new Name("AAA"),new Name("ABC"), new Name("AADDE")};
Arrays.sort(arr);
for(Name nm:arr){
System.out.println(nm.getLastName());
}
}
}
关于java - 用Java语言对数组列表进行排序,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/2439299/