Common string methods in Java - Practice Problems & Coding Challenges

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Challenge - 5 Problems

💻 code output

intermediate

Output of substring and length methods

What is the output of the following Java code?

Java

public class Main {
    public static void main(String[] args) {
        String s = "HelloWorld";
        System.out.println(s.substring(2, 7) + " " + s.length());
    }
}

A lloWo 9

B lloWo 10

C loWor 10

D loWor 9

💻 code output

intermediate

Result of toUpperCase and trim methods

What will be printed by this Java program?

Java

public class Main {
    public static void main(String[] args) {
        String s = "  java Programming  ";
        System.out.println(s.trim().toUpperCase());
    }
}

A JAVA PROGRAMMING

B GNIMMARGORP AVAJ

C java programming

D AVA PROGRAMMING

💻 code output

advanced

Output of replace and equals methods

What is the output of this Java code snippet?

Java

public class Main {
    public static void main(String[] args) {
        String s1 = "apple";
        String s2 = s1.replace('p', 'b');
        System.out.println(s2.equals("abble"));
    }
}

A true

B false

C Compilation error

D Runtime exception

💻 code output

advanced

Output of indexOf and charAt methods

What will this Java program print?

Java

public class Main {
    public static void main(String[] args) {
        String s = "Programming";
        int index = s.indexOf('g');
        char c = s.charAt(index + 1);
        System.out.println(c);
    }
}

A i

B m

C r

D a

💻 code output

expert

Final value of string after chained methods

What is the final output of this Java code?

Java

public class Main {
    public static void main(String[] args) {
        String s = "  Java123 Programming456  ";
        s = s.trim().replaceAll("\\d", "").toLowerCase();
        System.out.println(s);
    }
}

A javaprogramming

B java123 programming456

C gnimmargorp avaj

D java programming