JuniorTheoryCommon

What does the program print?

JAVA

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

java

Expecting JAVA: a String never changes; toUpperCase returns a new string, which is lost here because it is not assigned back to s.
Expecting a compile error: calling a method and ignoring its result is legal in Java, so the line runs and leaves s as it was.

How would you change the program so that it prints JAVA?
Why did the designers of Java make String immutable?

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Back to questions

JuniorTheoryCommon

What does the program print?

JAVA

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

java

Expecting JAVA: a String never changes; toUpperCase returns a new string, which is lost here because it is not assigned back to s.
Expecting a compile error: calling a method and ignoring its result is legal in Java, so the line runs and leaves s as it was.

How would you change the program so that it prints JAVA?
Why did the designers of Java make String immutable?

Back to questions Open topic in roadmap →Answer it yourself — Quiz