Java Basics - Arrays 2

Arrays and Loops

 We can pass arrays through functions.

For example public double calculateAverage(double [] temperatures){


If we look up and index beyond the size of the array we will get the following error: "ArrayIndexOutOfBoundsException"


Therefore it is important to check that the array is not out of bounds.

__________________________________________________________________

How to search for the minimum number in the array:

 Lets make the following program:

/*
*Searches an array of speed for the fastest(smallest value)
*@param speed array of speeds
*@return double the fastest speed found
*/

public double search(double [] search){
int size = search.length;
double min=speed[0];

for(int i = 1; i<=size; i++){
   if(search[i]<min) min = search[i];
}

return min;
}

________________

How to reverse an array of strings example

 public void printInReverse(String[] stringArray) {
for (int i = stringArray.length - 1; i>=0; i--){
System.out.println(stringArray[i]);
}
}


















Comments

Post a Comment

Popular posts from this blog

OOP - Objects and Classes

Classes Classes and objects are different terms Classes are an object type. You can create as many objects as you want of a class For example if a class has many fields and one of those is country, then an object would be Australia. In summary Objects are to Classes what Variables  are to Data types. For example  class Pokemon { String name;        //Field String type;         //Field int health;            //Field boolean dodge(){                        //Methods    return Math.random()>0.5; } } In Java each class should be created in its own file and have the extension ".java" For examples classes might be  vehicle.java   or map.java ________________________________________ The main method: This is where the program starts Inside it you can create objects and call methods to run othe...
Read more

Java Basics - Errors

Syntax errors (Compile-time error) -Violation of Java's grammatical rules -Will not compile Runtime errors -Happens while programming is running -Will Cause the program to crash Bugs (logical) -Program that just does not do what you expect.
Read more

Java Basics - Arrays 1

Arrays  Arrays allow us to store many variables or strings in one place. For example month[0] = "January"; month[1] = "February"; month[2] = "March"; We can add numbers as well int number[0] =1; int number[1] = 5; int sum = number[0] and number [1]; //sum = 6; How do we declare an array int [] numbers {12,-2,4,6,-9,0,2}; double[] numbers {12.896,-2,4,6,-9.2,0,2};
Read more