import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone {
int b[] = {1,2,3,4,5,6,7};
//Arrays.sort(b, (x,y) -> y-x);
}
}
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[7, 6, 5, 4, 3, 2, 1]
[1, 2, 3, 4, 5, 6, 7]