爪哇国新游记之八----读写文件及数组排序

        List<Integer> ls=new ArrayList<Integer>();
        
        ls.add(-1);
        ls.add(11);
        ls.add(100);
        ls.add(8);
        ls.add(2);
        ls.add(10);
        
        Collections.sort(ls);// 升序排列
        
        System.out.print("排序后结果是：");
        for(int i:ls){
            System.out.print(i+",");
        }
        System.out.println();
        
        Collections.reverse(ls);// 颠倒
        System.out.print("颠倒后结果是：");
        for(int i:ls){
            System.out.print(i+",");
        }

public class Emp  implements Comparable{
    private int age;
    private int salary;
    private String name;
    
    public Emp(String name,int age,int salary){
        this.name=name;
        this.age=age;
        this.salary=salary;
    }
    
    public String toString(){
        StringBuilder sb=new StringBuilder();
        
        sb.append("姓名:"+name);
        sb.append(" 年龄:"+age);
        sb.append(" 薪水:"+salary);

        
        return sb.toString();
    }
    
    @Override
    public int compareTo(Object o) {
        Emp another = (Emp) o;
        
        return this.name.compareTo(another.name);
        
        /*if(this.salary!=another.salary){
            return this.salary-another.salary;
        }else{
            return this.age-another.age;
        }*/
    }
    
    
    public static void main(String[] args){
        List<Emp> ls=new ArrayList<Emp>();
        
        ls.add(new Emp("Andy",20,4500));
        ls.add(new Emp("Cdins",30,10000));
        ls.add(new Emp("Douasa",40,30000));
        ls.add(new Emp("cahsa",20,5000));
        ls.add(new Emp("Hewqw",30,15000));
        ls.add(new Emp("Xawew",60,30000));
        ls.add(new Emp("Baod",30,30000));
        
        Collections.sort(ls);// 按compareTo中规则排列
        
        System.out.println("排序后结果是：");
        for(Emp i:ls){
            System.out.println(i.toString());
        }
        
    }
}

public class WriteSample{
    public static void main(String[] args){
        try {
            BufferedWriter out = new BufferedWriter(new FileWriter("c://write.txt"));
            
            out.write("张三 23 男 3500\r\n");
            out.write("李四 24 女 13500\r\n");
            out.write("王五 25 男 1500\r\n");
            out.write("赵六 93 女 1300");
            
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

class Emp  implements Comparable{
    String name;
    int age;
    String sex;
    int salary;
    
    public Emp(String line){
        String[] arr=line.split(" ");
        name=arr[0];
        age=Integer.parseInt(arr[1]);
        sex=arr[2];
        salary=Integer.parseInt(arr[3]);
    }
    
    public String toString(){
        StringBuilder sb=new StringBuilder();
        
        sb.append("姓名:"+name);
        sb.append(" 年龄:"+age);
        sb.append(" 性别:"+sex);
        sb.append(" 薪水:"+salary);
        
        return sb.toString();
    }
    
    @Override
    public int compareTo(Object o) {
        Emp another = (Emp) o;
        
        return this.salary-another.salary;//this.name.compareTo(another.name);
        
        /*if(this.salary!=another.salary){
            return this.salary-another.salary;
        }else{
            return this.age-another.age;
        }*/
    }
}
public class ReadSample{
    public static void main(String[] args){
        try {
            List<Emp> ls=new ArrayList<Emp>();
            BufferedReader in = new BufferedReader(new FileReader("c://write.txt"));
            String str;
            while ((str = in.readLine()) != null) {
                ls.add(new Emp(str));
            }
            in.close();
            
            
            Collections.sort(ls);
            
            for(Emp e:ls){
                System.out.println(e);
            }
        } catch (IOException e) {
        }

    }
}