Question

How to get string length in Java

Answer 1

class Program {
    public static void main(String[] args) {
        try {
 
            String s1 = "Java";
            String s2 = "Programming";
            String s3 = s1 + " " + s2;
 
            int l1 = s1.length();
            int l2 = s2.length();
            int l3 = s3.length();
 
            System.out.println(l1);
            System.out.println(l2);
            System.out.println(l3);
 
        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}


 
/*
              
run:
        
4
11
16
     
*/

 

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Answer 2

class Program {
    public static void main(String[] args) {
        try {
 
            int len = "java".length();
 
            System.out.println(len);
 
        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}


 
/*
              
run:
        
4

*/

 

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Answer 3

class Program {
    public static void main(String[] args) {
        try {
 
            String s = "";
 
            int len = s.length();
            System.out.println(len);
 
        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}


 
/*
              
run:
        
0

*/

 

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Answer 4

class Program {
    public static void main(String[] args) {
        try {
 
            String s = null;
 
            int l = s.length();
            System.out.println(l);
 
        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }
}


 
/*
              
run:
        
java.lang.NullPointerException: Cannot invoke "String.length()" because "<local1>" is null

*/

 

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