Java: Check whether a given string starts with the contents of another string

Last update on May 21 2025 12:50:43 (UTC/GMT +8 hours)

26. Starts With Substring

Write a Java program to check whether a given string starts with another string.

Visual Presentation:

Sample Solution:

Java Code:

// Define a public class named Exercise26.
public class Exercise26 {
    
    // Define the main method.
    public static void main(String[] args) {
        // Declare and initialize two string variables.
        String str1 = "Red is favorite color.";
        String str2 = "Orange is also my favorite color.";

        // The String to check the above two Strings to see
        // if they start with this value (Red).
        String startStr = "Red";

        // Check if the first two Strings start with startStr.
        boolean starts1 = str1.startsWith(startStr);
        boolean starts2 = str2.startsWith(startStr);

        // Display the results of the startsWith calls.
        System.out.println(str1 + " starts with " +
             startStr + "? " + starts1);
        System.out.println(str2 + " starts with " +
             startStr + "? " + starts2);
    }
}

Sample Output:

Red is favorite color. starts with Red? true                                                                  
Orange is also my favorite color. starts with Red? false

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to check if a string starts with a specified prefix and display a confirmation message.
• Write a Java program to test multiple prefixes against a string and list those that match.
• Write a Java program to simulate the startsWith method without using the built-in function.
• Write a Java program to check if a string starts with a substring after trimming leading spaces.

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