Question

How to get the StringBuilder capacity in Java

Answer 1

public class MyClass {
    public static void main(String args[]) {
        StringBuilder sb = new StringBuilder("Java");  

        System.out.println(sb.capacity());
    }
}



/*
run:

20

*/

 

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Answer 2

public class MyClass {
    public static void main(String args[]) {
        StringBuilder sb = new StringBuilder();  

        System.out.println(sb.capacity());
    }
}



/*
run:

16

*/

 

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Answer 3

public class MyClass {
    public static void main(String args[]) {
        StringBuilder sb = new StringBuilder();  
        System.out.println(sb.capacity());
        
        sb.append("Java");  
        System.out.println(sb.capacity());
    }
}



/*
run:

16
16

*/

 

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Answer 4

public class MyClass {
    public static void main(String args[]) {
        StringBuilder sb = new StringBuilder();  
        System.out.println(sb.capacity());
        
        sb.append("12345678");  
        System.out.println(sb.capacity());
        
        sb.append("abcdefgh");  
        System.out.println(sb.capacity());
    }
}



/*
run:

16
16
16

*/

 

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Answer 5

public class MyClass {
    public static void main(String args[]) {
        StringBuilder sb = new StringBuilder();  
        System.out.println(sb.capacity());
        
        sb.append("12345678");  
        System.out.println(sb.capacity());
        
        sb.append("abcdefgh");  
        System.out.println(sb.capacity());
        
        sb.append("W"); // (16 * 2) + 2
        System.out.println(sb.capacity());
    }
}



/*
run:

16
16
16
34

*/

 

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