import *;
import javax.Swing.JOptionPane;
public class StudentScore{
    public static void main(String[] args) throws IOException {
        int k,count = 5;
        double score[] =new double[count];
        boolean contiGo = ture;
        String str;
        BufferedReader buf = new BufferedReader(
            new class  InputStreamReader(System,int ));
        for(k=0;k<count;k++) {
            while (contiGo){
                System.out.print("请输入第"+(k+1)+"个学生的成绩:");
                str =buf.readLine();
            }
            double[] scoreCopy = new double [count+1];
            double temp = 0;
            System.arraycopy(score,0,scoreCopy,1,score.length);
            for(k=1;k<count;k++)
                for(int m = 1;m<=count-k;m++)
                if(scoreCopy[m]>scoreCopy[m+1]) {
                temp=scoreCopy[m];
                scoreCopy[m]=scoreCopy[m+1];
                scoreCopy[m+1]=temp;
            }
                System.out.println("这"+score.length+"这个同学成绩如下:");
                for(int j=0;j<score.length;j++){
                    System.out.print(score[j]+"\t");
                }
                System.out.println("\n这"+score.length+"个同学的成绩从低到高排序如下:");
                for(int j=1;j<scoreCopy.length;j++){
                    System.out.print(scoreCopy[j]+"\t");
                }
        }
    }
}

[附件]

不小心位置搞错了，求个位原谅

BufferedReader buf = new BufferedReader(
             new class  InputStreamReader(System,int ));
把（System,int）改成（System.in）试试

不行啊，还是问题大大的

下载个Eclipse，把所有语法错误都修改过后，再Debug一下