Why strings are special in Java - See It in Action

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Why strings are special in Java

📖 Scenario: Imagine you are building a simple program to manage names of people in a list. You want to understand how Java handles text data, especially strings, because strings are used everywhere in programs.

🎯 Goal: You will create a small Java program that shows how strings are created, compared, and why they behave differently from other objects.

📋 What You'll Learn

Create two string variables with the same text using string literals

Create a third string variable using the new keyword with the same text

Compare the strings using == and equals() methods

Print the results of the comparisons

💡 Why This Matters

🌍 Real World

Understanding string behavior helps avoid bugs when comparing text in Java programs, such as user input validation or searching.

💼 Career

Java developers frequently work with strings, so knowing how string objects behave is essential for writing correct and efficient code.

1

Create two string variables using string literals

Create two string variables called str1 and str2 and assign both the exact value "hello" using string literals.

Java

# Create two string variables str1 and str2 with value "hello"
// Your code here

💡 Need a hint?

Use double quotes to create string literals in Java, like "hello".

2

Create a third string variable using the new keyword

Add a third string variable called str3 and assign it the exact value "hello" using the new String("hello") constructor.

Java

public class Main {
    public static void main(String[] args) {
        String str1 = "hello";
        String str2 = "hello";
        // Create str3 using new String("hello")
    }
}

💡 Need a hint?

Use new String("hello") to create a new String object explicitly.

3

Compare the strings using == and equals()

Write code to compare str1 and str2 using == and store the result in a boolean variable called compareLiteral. Then compare str1 and str3 using == and store the result in compareNew. Finally, compare str1 and str3 using equals() and store the result in compareEquals.

Java

public class Main {
    public static void main(String[] args) {
        String str1 = "hello";
        String str2 = "hello";
        String str3 = new String("hello");
        // Compare str1 and str2 with == and store in compareLiteral
        // Compare str1 and str3 with == and store in compareNew
        // Compare str1 and str3 with equals() and store in compareEquals
    }
}

💡 Need a hint?

Use == to compare references and equals() to compare string content.

4

Print the results of the comparisons

Add System.out.println statements to print the values of compareLiteral, compareNew, and compareEquals each on a new line.

Java

public class Main {
    public static void main(String[] args) {
        String str1 = "hello";
        String str2 = "hello";
        String str3 = new String("hello");

        boolean compareLiteral = (str1 == str2);
        boolean compareNew = (str1 == str3);
        boolean compareEquals = str1.equals(str3);

        // Print compareLiteral
        // Print compareNew
        // Print compareEquals
    }
}

💡 Need a hint?

Use System.out.println(variableName); to print each boolean value.