Java Basics. Lesson 5

Март 3, 2021

Содержание

2. Agenda 02 03 04 Arrays Initializers and Anonymous Arrays “for each” loop Array Copying Array Sorting
3. Array copying 02 int[] smallPrimes = {2, 3, 5, 7} ; new int[] {17, 19, 23}
4. “for each” loop for (variable : collection) statement for(int el : smallPrimes) System.out.println(el);
5. Array Copying int[] luckyNumbers = smallPrimes ; luckyNumbers[3] = 12; int [] copiedValues = Arrays.copyOf(luckyNumbers, luckyNumbers.length);
6. Array Sorting Arrays.sort(a);
7. Multidimensional Array int [][] matrix = new int[2][3]; int [][] matrixInitialized = {{1,2}, {3,4}, {5,6}};
8. Ragged Array Arrays in which different arrays have different length 1 1 1 1 2 1
9. Materials https://www.hackerrank.com/lesson-5 Homework Chapter 3.10 - 3.10.7 inclusive Reading
11. Скачать презентацию

Слайд 2

Agenda
02
03
04
Arrays Initializers and Anonymous Arrays
“for each” loop
Array Copying
Array Sorting
01
05
Multidimensional Array
06
Ragged Array

Agenda 02 03 04 Arrays Initializers and Anonymous Arrays “for each” loop

Слайд 3

Array copying
02
int[] smallPrimes = {2, 3, 5, 7} ;
new int[] {17, 19,

Array copying 02 int[] smallPrimes = {2, 3, 5, 7} ; new

23}

01

Слайд 4

“for each” loop
for (variable : collection) statement
for(int el : smallPrimes) System.out.println(el);

“for each” loop for (variable : collection) statement for(int el : smallPrimes) System.out.println(el);

Слайд 5

Array Copying
int[] luckyNumbers = smallPrimes ;
luckyNumbers[3] = 12;
int [] copiedValues = Arrays.copyOf(luckyNumbers,

Array Copying int[] luckyNumbers = smallPrimes ; luckyNumbers[3] = 12; int [] copiedValues = Arrays.copyOf(luckyNumbers, luckyNumbers.length);

luckyNumbers.length);

Слайд 6

Array Sorting
Arrays.sort(a);

Array Sorting Arrays.sort(a);

Слайд 7

Multidimensional Array
int [][] matrix = new int[2][3];
int [][] matrixInitialized = {{1,2}, {3,4},

Multidimensional Array int [][] matrix = new int[2][3]; int [][] matrixInitialized = {{1,2}, {3,4}, {5,6}};

{5,6}};

Слайд 8

Ragged Array
Arrays in which different arrays have different length
1
1 1
1 2 1
1

Ragged Array Arrays in which different arrays have different length 1 1

3 3 1
1 4 6 4 1

Слайд 9

Materials
https://www.hackerrank.com/lesson-5
Homework
Chapter 3.10 - 3.10.7 inclusive
Reading

Materials https://www.hackerrank.com/lesson-5 Homework Chapter 3.10 - 3.10.7 inclusive Reading