import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class TestListSort {
private String name;
private int score;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
public TestListSort(String name, int score) {
super();
this.name = name;
this.score = score;
}
public static void main(String[] args) {
List<TestListSort> list = new ArrayList<>();
list.add(new TestListSort("张三",100));
list.add(new TestListSort("李四", 98));
list.add(new TestListSort("王五", 99));
list.add(new TestListSort("赵六", 98));
list.add(new TestListSort("马七", 89));
Collections.sort(list, new Comparator<TestListSort>() {
@Override public int compare(TestListSort o1, TestListSort o2) {
int i = o1.getScore() - o2.getScore();
return i;
}
});
for (TestListSort testListSort:list){
System.out.println("姓名：" testListSort.getName() "\t" "分数：" testListSort.getScore());
}
}
}
当用o1-o2时，是正序排列，当o2-o1时，是倒序排列。
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class Test implements Comparable<Test> {
private String name;
private int score;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
public Test(String name, int score) {
super();
this.name = name;
this.score = score;
}
@Override public int compareTo(Test o) {
int i = this.score - o.score; //正序排列// int i = o.score-this.score;//倒序排列 return i;
}
public static void main(String[] args) {
List<Test> list = new ArrayList<>();
list.add(new Test("张三",100));
list.add(new Test("李四", 98));
list.add(new Test("王五", 99));
list.add(new Test("赵六", 98));
list.add(new Test("马七", 89));
Collections.sort(list);
for (Test test:list){
System.out.println("姓名：" test.getName() "\t" "分数：" test.getScore());
}
}
}
