View Compilation Error

0_0_6342857_15384\Main.java:45: cannot find symbol
symbol  : variable df
location: class Main
                System.out.print(df.format(score1[i]));
                                 ^
0_0_6342857_15384\Main.java:47: cannot find symbol
symbol  : variable df
location: class Main
		System.out.print(df.format(score1[n-1]));
		                 ^
0_0_6342857_15384\Main.java:51: cannot find symbol
symbol  : variable df
location: class Main
                System.out.print(df.format(score2[i]));
                                 ^
0_0_6342857_15384\Main.java:53: cannot find symbol
symbol  : variable df
location: class Main
            System.out.print(df.format(score2[m-1]));
                             ^
4 errors