Establish a link between two objects way, it is an object as a property of another object to the process, such as:
class Women{
private Men men;
private String name；
private char sex；
int age；
public Women(){
}
public Women(String name){
this.name=name;
}
}
class Men{
String name；
char sex；
int age；
public Men(){
}
public Men(String name){
this.name=name;
}
}