JAVA练习

编写一个程序，提示用户输入学生数量后，再依次输入姓名和成绩，按照成绩的降序来打印学生的姓 名

public class Test4 {

// 编写一个程序，提示用户输入学生数量后，再依次输入姓名和成绩，按照成绩的降序来打印学生的姓

名

public static void main ( String [] args ) {

System . out . println ( " 输入学生数量 " );

Scanner sc = new Scanner ( System . in );

int len = sc . nextInt ();

String [] names = new String [ len ];

int [] scores = new int [ len ];

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

names [ i ] = inputName ( sc );

scores [ i ] = inputScore ( sc );

}

sort ( names , scores );

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

System . out . println ( " 第 " + ( i + 1 ) + " 名学生： " + names [ i ] + ", 成绩

为 :" + scores [ i ]);

}

}

public static String inputName ( Scanner sc ) {

System . out . println ( " 姓名： " );

String tmp = "" ;

while ( true ) {

tmp = sc . next ();

if ( tmp . length () > 20 || tmp . length () < 6 ) {

System . out . println ( " 输入数据不合法，请重新输入 " );

} else

break ;

}

return tmp ;

}

public static int inputScore ( Scanner sc ) {

System . out . println ( " 成绩： " );

int tmp = 0 ;

while ( true ) {

tmp = sc . nextInt ();

if ( tmp > 100 || tmp < 0 ) {

System . out . println ( " 输入数据不合法，请重新输入 " );

} else

break ;

}

return tmp ;

}

public static void sort ( String [] names , int [] scores ) {

for ( int i = 1 ; i < names . length ; i ++ ) {

for ( int k = 0 ; k < names . length - i ; k ++ ) {

if ( scores [ k ] < scores [ k + 1 ]) {

int tmp = scores [ k ];

scores [ k ] = scores [ k + 1 ];

scores [ k + 1 ] = tmp ;

String stmp = names [ k ];

names [ k ] = names [ k + 1 ];

names [ k + 1 ] = stmp ;

}

}

}

}

}