範例

public static final int YESTERDAY = 0;
public static final int TODAY = 1;
public static final int TOMORROW = 2;

public static void main( String[] args ) {
int dateType = Integer.parseInt( args[ 0 ] );

Calendar calendar = Calendar.getInstance();
switch ( dateType ) {
case 0:
calendar.add( Calendar.DATE, -1 );
break ;
case 1:
break ;
case 2:
calendar.add( Calendar.DATE, 1 );
break ;
}

System.out.println( calendar.getTime() );
}

解決方案
新增 default 標籤到 switch 陳述式。

public static final int YESTERDAY = 0;
public static final int TODAY = 1;
public static final int TOMORROW = 2;

public static void main( String[] args ) {
int dateType = Integer.parseInt( args[ 0 ] );

Calendar calendar = Calendar.getInstance();
switch ( dateType ) {
case 0:
calendar.add( Calendar.DATE, -1 );
break ;
case 1:
break ;
case 2:
calendar.add( Calendar.DATE, 1 );
break ;
default :
break ;
}

System.out.println( calendar.getTime() );
}