[Primitive Values, Wrapper Classes, Types and Casting]

What gets printed?

char[] set = {'*','D','5'};

System.out.print(Character.isDigit(set[2]) + " ");
System.out.print(Character.isWhitespace(set[0]) + " ");
System.out.print(Character.isLetterOrDigit(set[1]));

Question

[Primitive Values, Wrapper Classes, Types and Casting] 

        What gets printed?
    

    
char[] set = {'*','D','5'};

System.out.print(Character.isDigit(set[2]) + " ");
System.out.print(Character.isWhitespace(set[0]) + " ");
System.out.print(Character.isLetterOrDigit(set[1]));

Accepted Answer

Output: true false true
    

    

        Step-by-Step Analysis:

        
            The array is:
        

        
set = {'*', 'D', '5'}
        

        
            
                Index
                Character
            
            
                0
                *
            
            
                1
                D
            
            
                2
                5
            
        

        Line 1:

        
Character.isDigit(set[2])
        

        
            set[2] = '5'
        

        
            '5' is a digit → 
        

        
Result = true
        

        Line 2:

        
Character.isWhitespace(set[0])
        

        
            set[0] = '*'
        

        
            '*' is NOT a whitespace character → 
        

        
Result = false
        

        Line 3:

        
Character.isLetterOrDigit(set[1])
        

        
            set[1] = 'D'
        

        
            'D' is a letter → 
        

        
Result = true
        

        Final Output:

        
true false true
        

        Important Concept:

        
            isDigit() → checks numeric characters
            isWhitespace() → checks spaces, tabs
            isLetterOrDigit() → checks letters or digits
        

        Conclusion:

        
            Each method checks a specific property of characters, resulting in:
        

        
true false true

[Primitive Values, Wrapper Classes, Types and Casting] What gets printed? char[] set = {'*','D','5'}; System.out.print(Character.isDigit(set[2]) + " "); System.out.print(Character.isWhitespace(set[0]) + " "); System.out.print(Character.isLetterOrDigit(set[1]));

Answer with Explanation

Step-by-Step Analysis:

Line 1:

Line 2:

Line 3:

Final Output:

Important Concept:

Conclusion:

[Primitive Values, Wrapper Classes, Types and Casting]

What gets printed?

char[] set = {'*','D','5'};
System.out.print(Character.isDigit(set[2]) + " ");
System.out.print(Character.isWhitespace(set[0]) + " ");
System.out.print(Character.isLetterOrDigit(set[1]));