Switch statement in java accept which datatypes

Question

I got a error in this code

System.out.println("enter grade ");
Scanner input2 = new Scanner(System.in);
String grade = input2.nextLine();
switch(grade)
{
  case "a":
    g=10;
    break;
  case "b":
    g=8;
    break;
  default:
   System.out.println("invalid grade");
   break;
}

I am using eclipse kepler. It is giving me the correct output.

But the same code when written in eclipse helios, it says like :

Cannot switch on a value of type String. Only convertible int values or enum constants are permitted

Help me fixing this.

Suresh Atta · Accepted Answer · 2013-10-18 12:40:58Z

11

You are using JDK <1.7. Switch on Strings won't work below JDK's.

So shift to 1.7 or do not use String's in Switch case.

May be a char type suits for you, because you are using a single character in String for your need.

Look in that way. Then it turns

//logic to get grade char and then 
    switch (grade) {
            case 'a':
                g = 10;
                break;
            case 'b':
                g = 8;
                break;
            default:
                System.out.println("invalid grade");
                break;
            }

edited Oct 18, 2013 at 12:40

answered Oct 18, 2013 at 12:35

Suresh Atta

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Comments

user987339 · Accepted Answer · 2013-10-18 12:36:41Z

1

Switch statements with String cases have been implemented in Java SE 7. SO check your JDK in eclipse.

answered Oct 18, 2013 at 12:36

user987339

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Comments

srihari · Accepted Answer · 2013-10-18 12:38:43Z

1

you may be using jdk which is less than 1.7,check your java version in the following way

right click on your project
click configure build path then go to libraries and check which jdk
does your eclipse use.

If it is less than 1.7 then give the path for 1.7

answered Oct 18, 2013 at 12:38

srihari

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Comments

Winzu · Accepted Answer · 2013-10-18 12:36:30Z

0

Just change String to char.

case "a":

to

case 'a':

Strings are not accepted in switch before Java 7, but chars are.

answered Oct 18, 2013 at 12:36

Winzu

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Comments

Suresh Atta · Accepted Answer · 2013-10-18 14:38:07Z

0

Change your string to char, and "" to ''

char c = grade.charAt(0);

switch(c)
{
.
.
}

edited Oct 18, 2013 at 14:38

Suresh Atta

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answered Oct 18, 2013 at 12:42

Ashu Phaugat

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Comments

Bertrand Martel · Accepted Answer · 2016-07-20 20:23:29Z

0

In Eclipse Mars, I didn't use " " at all for int type.

int grade;
switch(grade)
{
 case 1:
 break;
 case 2:
 break;
 default:
 break;
}

Hope it will work for others

edited Jul 20, 2016 at 20:23

Bertrand Martel

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answered Jul 20, 2016 at 19:11

mithun

1

Comments

CosmicGiant · Accepted Answer · 2016-07-24 19:00:30Z

0

For string cases you can use, for example:

String choice;
switch(choice)
{
case "1": 
  break;
case "2":
  break;
default: break;
}

edited Jul 24, 2016 at 19:00

CosmicGiant

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answered Jul 24, 2016 at 18:32

mithun

1

1 Comment

CosmicGiant Over a year ago

While code-only answers are not forbidden, please understand that this is a Q&A community, rather than a crowd-sourcing one, and that, usually, if the OP understood the code being posted as an answer, he/she would have come up with a similar solution on his/her own, and wouldn't have posted a question in the first place. As such, please provide context to your answer and/or code by explaining how and/or why it works.

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