Iteration with 2D Arrays
Jupyter Notebook on Iteration with 2D arrays in Java
/*
* Creator: Nighthawk Coding Society
* Mini Lab Name: Hello Series,featuring Monkey Jumpers
*/
/**
* Class for Monkeys: a 2D array of Monkeys
* As well as method to print the Poem
*/
class MonkeyLoop {
//The area between class definition and the 1st method is where we keep data for object in Java
String [][] monkeys; //2D Array: AP CSA Unit 8: 2D array of strings
//2D array is like a grid [x][y]
// or like a spreadsheet [row][column]
/**
* Constructor initializes a 2D array of Monkeys
*/
public MonkeyLoop() {
//Storing Data in 2D arrays
monkeys = new String[][]{ //2D array above is just a name, "new" makes a container ("object")
//Monkey 0
{
"ʕง ͠° ͟ل͜ ͡°)ʔ", //[0][0] eyes
" \\_⏄_/ ",//[0][1] chin
" --0-- ", //[0][2] body
" ⎛ ⎞ " //[0][3] legs
},
//Monkey 1
{
" ʕ༼ ◕_◕ ༽ʔ", //[1][0]
" \\_⎏_/ ",
" ++1++ ",
" ⌋ ⌊ "
},
//Monkey 2
{
" ʕ(▀ ⍡ ▀)ʔ", //[2][0]
" \\_⎐_/ ",
" <-2-> ",
" 〈 〉 "
},
//Monkey 3
{
"ʕ ͡° ͜ʖ ° ͡ʔ", //[3][0]
" \\_⍾_/ ",
" ==3== ",
" _/ \\_ "
},
//Monkey 4
{
" (◕‿◕✿) ", //[4][0]
" \\_⍾_/ ", //[4][1]
" ==4== ", //[4][2]
" _/ \\_ " //[4][3]
},
};
}
/**
* Loop and print monkeys in array
* ... repeat until you reach zero ...
*/
public void printPoem() {
//begin the poem
System.out.println();
System.out.println("Monkey Jumpers Poem in Java Loopy");
// monkeys (non-primitive) defined in constructor knows its length
int monkeyCount = monkeys.length;
for (int i = monkeyCount; i >= 1; i--) //loops through 2D array length backwards
{
//this print statement shows current count of Monkeys
// concatenation (+) of the loop variable and string to form a countdown message
System.out.println(i + " little monkeys jumping on the bed...");
//how many separate parts are there in a monkey monkey?
for (int row = 0; row < monkeyCount; row++) { //cycles through "cells" of 2d array
/*cycles through columns to print
each monkey part by part, will eventually print entire column*/
for (int col = 0; col < monkeys[row].length; col++) {
// prints specific part of the monkey from the column
System.out.print(monkeys[row][col] + " ");
//this is new line between separate parts
System.out.println();
}
//this new line gives separation between stanza of poem
System.out.println();
}
//countdown for poem, decrementing monkeyCount variable by 1
monkeyCount -= 1;
}
//out of all the loops, prints finishing messages
System.out.println("No more monkeys jumping on the bed");
System.out.println("0000000000000000000000000000000000");
System.out.println(" THE END ");
}
/**
* A Java Driver/Test method that is the entry point for execution
*/
public static void main(String[] args) {
new MonkeyLoop().printPoem(); //a new monkey list and output in one step
}
}
MonkeyLoop.main(null);
Learning Inquiries
- Is this program in more of an Imperative Programming Style or OOP style? Explain.
- Observe variable assignments.
- Is each Monkey an object?
This 2D array program is definatley more of an Imperative Programming Style rather than Object-Oriented Programming style. This is because the program just prints out a 2D array of monkeys which aren't object but just a string of ASCII characters. There is no class for monkey that has attributes and methods so the program dosen't use OOP and can be replicated in other languages
- Study loops and zero based counting
- Study two-dimensional (2D) array references
- Explain different way you can access a 2D array
2D arrays can be refrenced through the row and collumn (2 dimensions).
class MyMonkeyLoop {
//The area between class definition and the 1st method is where we keep data for object in Java
String [][] monkeys; //2D Array: AP CSA Unit 8: 2D array of strings
//2D array is like a grid [x][y]
// or like a spreadsheet [row][column]
/**
* Constructor initializes a 2D array of Monkeys
*/
public MyMonkeyLoop() {
//Storing Data in 2D arrays
monkeys = new String[][]{ //2D array above is just a name, "new" makes a container ("object")
//Monkey 0
{
"ʕง ͠° ͟ل͜ ͡°)ʔ", //[0][0] eyes
" \\_⏄_/ ", //[0][1] chin
" --0-- ", //[0][2] body
" ⎛ ⎞ " //[0][3] legs
},
//Monkey 1
{
"ʕ༼ ◕_◕ ༽ʔ", //[1][0]
" \\_⎏_/ ",
" ++1++ ",
" ⌋ ⌊ "
},
//Monkey 2
{
"ʕ(▀ ⍡ ▀)ʔ", //[2][0]
" \\_⎐_/ ",
" <-2-> ",
" 〈 〉 "
},
//Monkey 3
{
"ʕ ͡° ͜ʖ ° ͡ʔ", //[3][0]
" \\_⍾_/ ",
" ==3== ",
" _/ \\_ "
},
//Monkey 4
{
"(◕‿◕✿)", //[4][0]
" \\_⍾_/ ", //[4][1]
" ==4== ", //[4][2]
" _/ \\_ " //[4][3]
},
};
}
/**
* Loop and print monkeys in array
* ... repeat until you reach zero ...
*/
public void printPoem() {
//begin the poem
System.out.println();
System.out.println("Monkey Jumpers Poem in Java Loopy");
// monkeys (non-primitive) defined in constructor knows its length
int monkeyCount = monkeys.length;
for (int i = monkeyCount; i >= 1; i--) { //loops through 2D array length backwards
//this print statement shows current count of Monkeys
// concatenation (+) of the loop variable and string to form a countdown message
System.out.println(i + " little monkeys jumping on the bed...");
for (int r=0; r<4; r++) {
for (int m=0; m<i; m++) {
System.out.print(monkeys[m][r] + " ");
}
System.out.println();
}
//countdown for poem, decrementing monkeyCount variable by 1
System.out.println();
monkeyCount -= 1;
}
//out of all the loops, prints finishing messages
System.out.println("No more monkeys jumping on the bed");
System.out.println("0000000000000000000000000000000000");
System.out.println(" THE END ");
}
/**
* A Java Driver/Test method that is the entry point for execution
*/
public static void main(String[] args) {
new MyMonkeyLoop().printPoem(); //a new monkey list and output in one step
}
}
MyMonkeyLoop.main(null);