求教，就以上课程而言以下有哪些不对?本人小白勿笑

public class HelloWorld {

public static void main(String[] args) {

int[] sorname = {89,-23,64,91,119,52,73,99,100};

HelloWorld dxname = new HelloWorld();

int[] backsorname = dxname.ffname(sorname);

System.out.println("考试成绩的前三名为：");

for(int i=(backsorname.length-1);(i>backsorname.length-4);i--) {

System.out.println(backsorname[i]);

}

}

public int[] ffname(int[] sorname) {

int a=0;

for(int i=0;i<sorname.length;i++) {

if(sorname[i] >=0 && sorname[i] <= 100) {

a=a+1;

}

}

int[] backsorname = new int [a];

int c = 0;

for(int b=0;b<sorname.length;b++) {

if(sorname[b] >=0 && sorname[b] <= 100) {

backsorname[c]=sorname[b];

c=c+1;

}

}

Arrays.sort(backsorname);

return backsorname;

}

}