JAVA的中文输入输出问题。。。

import java.io.*;
class chenjiguanlixitong
{
static String [][]  chengji=new String [4][6];
static int DC_scroe,JAVA_scroe,English_score;
static int Total_scroe;
static String name="";
public static void anykey_f()
{
char tChar;
System.out.println("   按任意键继续  ...   ");
try{
tChar=(char)System.in.read();

}catch(IOException e){}
}
    public static void input()throws UnsupportedEncodingException{
        BufferedReader in=new BufferedReader(new InputStreamReader(System.in,"UTF-8"));
        for(int i=0;i<=3;i++)
        {System.out.print("-------------------------------\n");
     System.out.println("请输入学生的学号 ：");
     System.out.flush();
     try{chengji[i][0]=in.readLine();
     }catch(IOException e){}
     System.out.println("请输入学生的姓名 ：");
     System.out.flush();
     try{chengji[i][1]=in.readLine();
     }catch(IOException e){}
     System.out.println("请输入学生的DC成绩 ：");
     System.out.flush();
     try{chengji[i][2]=in.readLine();
     }catch(IOException e){}
     System.out.println("请输入学生的JAVA成绩 ：");
     System.out.flush();
     try{chengji[i][3]=in.readLine();
     }catch(IOException e){}
     System.out.println("请输入学生的English成绩 ：");
     System.out.flush();
     try{chengji[i][4]=in.readLine();
     }catch(IOException e){}
        } 
         anykey_f();
    }
    public static void count(){
     for(int i=0;i<=3;i++)                       //将数据转化成int型，将进行加法计算
     {
     DC_scroe=Integer.valueOf(chengji[i][2]).intValue();
     JAVA_scroe=Integer.valueOf(chengji[i][3]).intValue();
     English_score=Integer.valueOf(chengji[i][4]).intValue();
     Total_scroe=DC_scroe+JAVA_scroe+English_score;
    
     chengji[i][5]=String.valueOf(Total_scroe);
     }
     for(int i=0;i<=3;i++)
     {
     System.out.print("-------------------------\n");
     System.out.println("学生 ："+chengji[i][1]+" 成绩总分为 "+chengji[i][5]);
     }
     anykey_f();
    }
    public static void bubble_sort(){//冒泡排序
int temp,flag; 
    int size=4; 
    int [] total_scroe=new int[4]; 
    String[] temp2;
    for(int i=0;i <=size-1;i++){ 
        total_scroe[i]=Integer.valueOf(chengji[i][5]).intValue(); 
    } 
    for(int i=0;i<size-1;i++){                          //将数据两两比较，将大的置于前 
        flag=0; 
        for(int j=0;j <size-i-1;j++) 
           if(total_scroe[j] <total_scroe[j+1]){ 
              flag=1; 
              temp=total_scroe[j+1]; 
              total_scroe[j+1]=total_scroe[j]; 
              total_scroe[j]=temp; 
              temp2=chengji[j+1];
              chengji[j+1]=chengji[j];
              chengji[j]=temp2;
           } 
           if(flag!=1)      
            break;     
    }
    System.out.println("按总分排序结果 ：");
    for(int i=0;i<=3;i++){
    System.out.println(chengji[i][1]+"成绩总分："+total_scroe[i]);
    }
    anykey_f();
    }
    public static void selection_sort()//选择排序
    {
    int temp=0;
    int [] total_scroe=new int[4];
    for(int i=0;i<=3;i++){     
    total_scroe[i]=Integer.valueOf(chengji[i][5]).intValue();
    }
    int base=0,compare=0,max=0,size=4;
    String [] temp2;
    for(base=0;base<size-1;base++){                            //将目前数据与后面数据中最大的对调
     max=base;
     for(compare=base+1;compare<size;compare++)
     if(total_scroe[compare]>total_scroe[max])
     max=compare;
     temp=total_scroe[max];
     total_scroe[max]=total_scroe[base];
     total_scroe[base]=temp;    
         temp2=chengji[max];
         chengji[max]=chengji[base];
         chengji[base]=temp2;    
    }
    System.out.println("按总分排序结果 ：");
    for(int i=0;i<=3;i++){
    System.out.println(chengji[i][1]+"成绩总分："+total_scroe[i]);
    }
    anykey_f();
    }    public static void query() throws UnsupportedEncodingException{
     BufferedReader in=new BufferedReader(new InputStreamReader(System.in,"UTF-8"));
     String st="";
     int k;
     System.out.print("------------------------------\n");
     System.out.print(" 请输入要查询学生的学号 ");
     System.out.flush();
     try{st=in.readLine();}catch(IOException e){
     }
     for(int i=0;i<=3;i++)
     {   int flag=0;
     if(chengji[i][0].equals(st))
     {   flag=1;
     k=i;
     System.out.println("学号 ："+chengji[k][0]);
     System.out.println("姓名 ："+chengji[k][1]);
     System.out.println("DC成绩 ："+chengji[k][2]);
     System.out.println("JAVA成绩 ："+chengji[k][3]);
     System.out.println("English成绩 ："+chengji[k][4]);
     System.out.println("总分 ："+chengji[k][5]);
     }
     if(flag!=0)
     break;
     if(i==3)
     System.out.println("无此信息记录，请重新输入...");   
     }
     anykey_f();
     }
    public static void main (String[] args) throws UnsupportedEncodingException{              //主函数
     BufferedReader in=new BufferedReader(new InputStreamReader(System.in,"UTF-8"));
     String op="";
     int option=0;
     chenjiguanlixitong obj=new chenjiguanlixitong();
     do{
     System.out.println("*********学生成绩管理系统**********");
            System.out.println("         <1>输入        ");
            System.out.println("         <2>总分统计        ");
            System.out.println("         <3>信息查询        ");
            System.out.println("         <4>总分排序（冒泡排序）        ");
            System.out.println("         <5>总分排序（选择排序）        ");
            System.out.println("         <6>退出        ");
            System.out.println("***********************************");
            op="";
            try{
             op=in.readLine();
            }catch(IOException e){}
            option=0;
            try{
             option=Integer.valueOf(op).intValue();
            }catch(NumberFormatException e){}
            System.out.println("");
            switch(option){
             case 1:
             obj.input();//输入函数
             break;
             case 2:
             obj.count();//统计总分函数
             break;
             case 3:
             obj.query();//查询函数
             break;
             case 4:
             obj.bubble_sort(); //冒泡排序函数
             break;
             case 5:
             obj.selection_sort(); //选择排序函数
             break;
             case 6:
             System.exit(0);  //退出程序
            
            }
     }while(true);
}
}
中文输出乱码。 该用什么方法转换成UTF-8```  代码中的那个好像不顶用...求助```