r115 / java-learning-with-derrick

Introduction to Java: Methods with Parameters

A java method has 6 components.

• modifier (public,private, protected, default)
• return type
• method name
• parameter list
• exception list
• method body

public float payCarBalance(float currentBalance, float monthlyRate, User currentUser, float amount){
    // Reduce current blance
        float updatedBalance = currentBalance - amount;
        
        return updatedBalance;
}

A method parameter must always have a type.

Preferred naming is in camelcase.

Recommended reading

• https://www.geeksforgeeks.org/methods-in-java/?ref=lbp
• https://www.cs.toronto.edu/~reid/web/javaparams.html
• https://www.geeksforgeeks.org/argument-vs-parameter-in-java/

Practise

• Attempt to apply a commission to the exchanged funds. A commission is calaculated as a percentage of the converted amount. The commission is then deducted from the converted amount. Allow the convert method to use a flexible commission rate.

Previous Classes

• Day 1
• Day 2
• Day 3
• Day 4

To access the code;

git fetch

git checkout day-3-static-variables-and-scope