实体类,有3个属性
entity.java
Integer id;
String name;
String sex;集合,list里面有10个实体类
for(int i=0; i<10; i++) {
list.add(entity);
}如果我想按照name排序,或者sex排序,怎么做?
entity.java
Integer id;
String name;
String sex;集合,list里面有10个实体类
for(int i=0; i<10; i++) {
list.add(entity);
}如果我想按照name排序,或者sex排序,怎么做?
public class TestObject implements Comparable{
private String name;
private String password;
public TestObject(String name, String password) {
super();
this.name = name;
this.password = password;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return name + "-" + password;
} @Override
public int compareTo(Object t) {
return this.name.compareTo(((TestObject)t).getName());
}
}import java.util.*;import obj.TestObject;public class Test {
public static void main(String arg[]) {
TestObject t1 = new TestObject("te2", "sad");
TestObject t2 = new TestObject("te1", "sad");
List list = new ArrayList();
list.add(t1);
list.add(t2);
Collections.sort(list);
System.out.println(list);
}
}当然, 如果不想修改实体类, 那就写一个比较器, 调用Collections.sort(List, Comparator)方法就行了.
我很想知道是不是真的能实现