import java.util.*;
class Test{
public static void main(String[] args){
ArrayList<Object> al=new ArrayList<Object>();
al.add(new A(3,4));
al.add(new A(4,6));
al.add(new A(3,4));
System.out.println(al);
Collections.sort(al,new B());
}
}
class A {
int x,y;
A(int x,int y){
this.x=x;
this.y=y;
}
public String toString(){
return x+" "+y;
}
}
class B implements Comparator{
public int compare(Object o1,Object o2){
A a1=(A)o1;
A a2=(A)o2;
return al.x>a2.x?0:1;//编译时说找不到符号,该怎么改呢,谢谢了啊
}
}
class Test{
public static void main(String[] args){
ArrayList<Object> al=new ArrayList<Object>();
al.add(new A(3,4));
al.add(new A(4,6));
al.add(new A(3,4));
System.out.println(al);
Collections.sort(al,new B());
}
}
class A {
int x,y;
A(int x,int y){
this.x=x;
this.y=y;
}
public String toString(){
return x+" "+y;
}
}
class B implements Comparator{
public int compare(Object o1,Object o2){
A a1=(A)o1;
A a2=(A)o2;
return al.x>a2.x?0:1;//编译时说找不到符号,该怎么改呢,谢谢了啊
}
}
ArrayList al = new ArrayList();
-----------------------
return al.x>a2.x?0:1;
||
return a1.x>a2.x?0:1;
1和l是不一样地