在 Switch 语句中使用 2 个变量
Using 2 variables in Switch statement
import java.util.Scanner;
class Test {
public static void main(String args[]) {
String charr;
try{
Scanner sc = new Scanner(System.in);
System.out.println("Enter the Value ");
charr = sc.next();
switch (charr +"|"+ charr) {
case "a|A" : System.out.println("a | A"); break;
case "b|B" : System.out.println("b | B"); break;
case "c|C" : System.out.println("c | C"); break;
case "d|D" : System.out.println("d | D"); break;
default: System.out.println("You are doing it wrong");
}
} catch(java.util.InputMismatchException e) {
System.out.println("Exception thrown :" + e);
}
System.out.println("Out of Block");
}
}
大家好,我的程序是只输入1个字符,但是我的switch语句可以识别小写字母或大写字母。
您可以使用多个大小写来识别大小写字母:
switch (charr) {
case "a": case "A" : System.out.println("a | A"); break;
case "b": case "B" : System.out.println("b | B"); break;
case "c": case "C" : System.out.println("c | C"); break;
case "d": case "D" : System.out.println("d | D"); break;
default: System.out.println("You are doing it wrong");
}
然而,更简单的替代方法是在检查之前转换为小写或大写:
switch (charr.toLowerCase()) {
case "a": System.out.println("a | A"); break;
case "b": System.out.println("b | B"); break;
case "c": System.out.println("c | C"); break;
case "d": System.out.println("d | D"); break;
default: System.out.println("You are doing it wrong");
}
如果您在 java 7 及更高版本中执行
尝试将字母转换为大写,如下所示
switch (charr.toUpperCase())
{
case "A" : System.out.println("a | A"); break;
case "B" : System.out.println("b | B"); break;
case "C" : System.out.println("c | C"); break;
case "D" : System.out.println("d | D"); break;
default: System.out.println("You are doing it wrong");
}
希望对您有所帮助。
只需将字符串用作 charr = sc.next().toLowerCase()
或 charr = sc.next().toUpperCase()
而不是使用 case.Let 表示您使用的 toLowercase();
而不是
switch (charr) {
case "a": System.out.println("a | A"); break;
case "b": System.out.println("a | A"); break;
case "c": System.out.println("a | A"); break;
case "d": System.out.println("a | A"); break;
default: System.out.println("You are doing it wrong");
}
注意:这将在 JAVA 7 中编译,否则使用 char 原始类型编译相同的
import java.util.Scanner;
class Test {
public static void main(String args[]) {
String charr;
try{
Scanner sc = new Scanner(System.in);
System.out.println("Enter the Value ");
charr = sc.next();
switch (charr +"|"+ charr) {
case "a|A" : System.out.println("a | A"); break;
case "b|B" : System.out.println("b | B"); break;
case "c|C" : System.out.println("c | C"); break;
case "d|D" : System.out.println("d | D"); break;
default: System.out.println("You are doing it wrong");
}
} catch(java.util.InputMismatchException e) {
System.out.println("Exception thrown :" + e);
}
System.out.println("Out of Block");
}
}
大家好,我的程序是只输入1个字符,但是我的switch语句可以识别小写字母或大写字母。
您可以使用多个大小写来识别大小写字母:
switch (charr) {
case "a": case "A" : System.out.println("a | A"); break;
case "b": case "B" : System.out.println("b | B"); break;
case "c": case "C" : System.out.println("c | C"); break;
case "d": case "D" : System.out.println("d | D"); break;
default: System.out.println("You are doing it wrong");
}
然而,更简单的替代方法是在检查之前转换为小写或大写:
switch (charr.toLowerCase()) {
case "a": System.out.println("a | A"); break;
case "b": System.out.println("b | B"); break;
case "c": System.out.println("c | C"); break;
case "d": System.out.println("d | D"); break;
default: System.out.println("You are doing it wrong");
}
如果您在 java 7 及更高版本中执行
尝试将字母转换为大写,如下所示
switch (charr.toUpperCase())
{
case "A" : System.out.println("a | A"); break;
case "B" : System.out.println("b | B"); break;
case "C" : System.out.println("c | C"); break;
case "D" : System.out.println("d | D"); break;
default: System.out.println("You are doing it wrong");
}
希望对您有所帮助。
只需将字符串用作 charr = sc.next().toLowerCase()
或 charr = sc.next().toUpperCase()
而不是使用 case.Let 表示您使用的 toLowercase();
而不是
switch (charr) {
case "a": System.out.println("a | A"); break;
case "b": System.out.println("a | A"); break;
case "c": System.out.println("a | A"); break;
case "d": System.out.println("a | A"); break;
default: System.out.println("You are doing it wrong");
}
注意:这将在 JAVA 7 中编译,否则使用 char 原始类型编译相同的