package lambda;

import java.util.Arrays;

import java.util.Comparator;

/**

* Created by Edwin Xu on 5/3/2020 3:05 PM

*/

public class Compare {

public void f(){

//排序整数

Integer arr[] = {1,2,3,34,2,-23,30,-34,90};//不能使用基本类型，是泛型

Arrays.sort(arr);//默认从小到大

for (int i :arr)System.out.print(i);

System.out.println();

//使用自定义比较器

class MyCompare implements Comparator<Integer>{

@Override

public int compare(Integer o1, Integer o2) {

return o2-o1;

}

}

Arrays.sort(arr,new MyCompare());

for (int i :arr) System.out.print(i);

System.out.println();

//使用lambda表达式

Arrays.sort(arr,(a,b)->a-b);

for (int i :arr)System.out.print(i);

System.out.println();

Arrays.sort(arr,

(a,b)->{

int a_ = a;

int b_ = b;

return b_-a_;

});

for (int i :arr)System.out.print(i);

System.out.println();

Arrays.sort(arr, new Comparator<Integer>() {

@Override

public int compare(Integer o1, Integer o2) {

return o1-o2;

}

});

for (int i :arr)System.out.print(i);

System.out.println();

}

public static void main(String[] args) {

new Compare().f();

}

}