Comparable用法详解
实现对象的排序
class Persion implements Comparable{
private String name;
private int age;
public Persion(String name,int age) {
this.name = name;
this.age = age;
}
@Override
public String toString() {
return "姓名：" + this.name + ",年龄：" + this.age;
}
@Override
public int compareTo(Persion o) {
if(this.age > o.age) {
return 1;
}else if(this.age < o.age) {
return -1;
}else {
return 0;
}
}
}
public class Compareable {
public static void main(String args[]) {
Persion per[] =new Persion [] {
new Persion("小李",39),
new Persion("小茗",19),
new Persion("小红",33)
};
Arrays.sort(per);
System.out.println(Arrays.toString(per));
}
}
返回结果：
[姓名：小茗,年龄：19, 姓名：小红,年龄：33, 姓名：小李,年龄：39]
结论以后不管何种情况下，只要是进行对象数组的排序都要实现Comparable<>接口
class Persion implements Comparable
private String name;
private int age;
public Persion(String name,int age) {
this.name = name;
this.age = age;
}
@Override
public String toString() {
return "姓名：" + this.name + ",年龄：" + this.age;
}
@Override
public int compareTo(Persion o) {
if(this.age > o.age) {
return 1;
}else if(this.age < o.age) {
return -1;
}else {
return 0;
}
}
}
public class Compareable {
public static void main(String args[]) {
Persion per[] =new Persion [] {
new Persion("小李",39),
new Persion("小茗",19),
new Persion("小红",33)
};
Arrays.sort(per);
System.out.println(Arrays.toString(per));
}
}
返回结果：
[姓名：小茗,年龄：19, 姓名：小红,年龄：33, 姓名：小李,年龄：39]
结论以后不管何种情况下，只要是进行对象数组的排序都要实现Comparable<>接口
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