Java Tutorial
Methods and Arrays
Create reusable methods and store fixed-size sequences in arrays.
Concept
Methods define reusable behavior. A method signature includes its name and parameter types, while its declared return type describes the result.
Arrays hold a fixed number of elements of one declared type. Indexes begin at zero, so valid indexes range from zero through length minus one.
Example
static int add(int a, int b) {
return a + b;
}
int[] marks = {72, 81, 65};
System.out.println(add(marks[0], marks[1]));
Type the example yourself and change at least one value. Small experiments reveal syntax and behavior faster than passive reading.
Practice Tasks
- Write a max(int a, int b) method.
- Find the average of an integer array.
- Reverse an array without using a collection.
Key Takeaways
- Methods improve reuse.
- Arrays are fixed-size.
- Check array bounds carefully.