string.toUpperCase() 和 string.toLowercase() 不打印
string.toUpperCase() and string.toLowercase() not printing
(序言) 我实际上认为这是一个简单的问题,但我相当
编程新手,所以这对我来说有点令人沮丧。这个问题涉及
显示执行代码时大写和小写字符串如何相互覆盖的问题。
代码如下:
import java.util.Scanner; //need for the scanner class
public class Manip
{
public static void main(String[] args)
{
String city; //to hold the user input
//create the scanner object here
Scanner keyboard = new Scanner(System.in);
//get the favorite city
//prompt the user to input the favorite city
System.out.print("Enter favorite city: ");
//read and store into city
city = keyboard.nextLine();
//display the number of characters.
System.out.print("String Length :" );
System.out.println(city.length());
//display the city in all upper case
System.out.println(city.toUpperCase() );
//Display the city in all lower case
System.out.println(city.toLowerCase() );
//Display the first character
keyboard.next();
}
}
代码的输出是-
enter favorite city: dallas
String Length :6
dallas
期望的输出是-
enter favorite city: dallas
String Length :6
DALLAS
dallas
我想知道为什么它不打印 "dallas" 两次,作为大写字母和小写字母。它似乎正在覆盖输入
我 运行 你的代码原样,它以大写和小写形式打印,但我注意到你有一条评论说 //Display the first character
,然后是 keyboard.next()
.这是唯一不正确的部分。要打印字符串的第一个字母(在本例中字符串为 city
),请使用此行:System.out.println(city.substring(0,1).toUpperCase());
下面是输出示例:
Enter favorite city: dallas.
String Length :6
DALLAS
dallas
D
(序言) 我实际上认为这是一个简单的问题,但我相当 编程新手,所以这对我来说有点令人沮丧。这个问题涉及 显示执行代码时大写和小写字符串如何相互覆盖的问题。
代码如下:
import java.util.Scanner; //need for the scanner class
public class Manip
{
public static void main(String[] args)
{
String city; //to hold the user input
//create the scanner object here
Scanner keyboard = new Scanner(System.in);
//get the favorite city
//prompt the user to input the favorite city
System.out.print("Enter favorite city: ");
//read and store into city
city = keyboard.nextLine();
//display the number of characters.
System.out.print("String Length :" );
System.out.println(city.length());
//display the city in all upper case
System.out.println(city.toUpperCase() );
//Display the city in all lower case
System.out.println(city.toLowerCase() );
//Display the first character
keyboard.next();
}
}
代码的输出是-
enter favorite city: dallas
String Length :6
dallas
期望的输出是-
enter favorite city: dallas
String Length :6
DALLAS
dallas
我想知道为什么它不打印 "dallas" 两次,作为大写字母和小写字母。它似乎正在覆盖输入
我 运行 你的代码原样,它以大写和小写形式打印,但我注意到你有一条评论说 //Display the first character
,然后是 keyboard.next()
.这是唯一不正确的部分。要打印字符串的第一个字母(在本例中字符串为 city
),请使用此行:System.out.println(city.substring(0,1).toUpperCase());
下面是输出示例:
Enter favorite city: dallas.
String Length :6
DALLAS
dallas
D