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‎src/main/java/com/examplehub/basics/Array.java‎

Lines changed: 178 additions & 183 deletions
Original file line numberDiff line numberDiff line change
@@ -4,189 +4,184 @@
44

55
public class Array {
66

7-
public static void main(String[] args) {
8-
int[] numbers = {1, 2, 3, 4, 5};
9-
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/*
11-
* numbers[0] = 1
12-
* numbers[1] = 2
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* numbers[2] = 3
14-
* numbers[3] = 4
15-
* numbers[4] = 5
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*/
17-
System.out.println("numbers[0] = " + numbers[0]);
18-
System.out.println("numbers[1] = " + numbers[1]);
19-
System.out.println("numbers[2] = " + numbers[2]);
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System.out.println("numbers[3] = " + numbers[3]);
21-
System.out.println("numbers[4] = " + numbers[4]);
22-
23-
/*
24-
* array index is out of bounds
25-
*/
26-
//System.out.println(numbers[-1]);
27-
//System.out.println(numbers[5]);
28-
29-
30-
/*
31-
* numbers[0] = 1
32-
* numbers[1] = 2
33-
* numbers[2] = 3
34-
* numbers[3] = 4
35-
* numbers[4] = 5
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*/
37-
for (int i = 0; i < 5; i++) {
38-
System.out.println("numbers[" + i + "] = " + numbers[i]);
39-
}
40-
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/*
42-
* length of numbers = 5
43-
*/
44-
System.out.println("length of numbers = " + numbers.length);
45-
46-
/*
47-
* numbers[0] = 1
48-
* numbers[1] = 2
49-
* numbers[2] = 3
50-
* numbers[3] = 4
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* numbers[4] = 5
52-
*/
53-
for (int i = 0; i < numbers.length; i++) {
54-
System.out.println("numbers[" + i + "] = " + numbers[i]);
55-
}
56-
57-
/*
58-
* numbers[4] = 5
59-
* numbers[3] = 4
60-
* numbers[2] = 3
61-
* numbers[1] = 2
62-
* numbers[0] = 1
63-
*/
64-
for (int i = numbers.length - 1; i >= 0; i--) {
65-
System.out.println("numbers[" + i + "] = " + numbers[i]);
66-
}
67-
68-
/*
69-
* 12345
70-
*/
71-
for (int number : numbers) {
72-
System.out.print(number);
73-
}
74-
System.out.println();
75-
76-
/*
77-
* [1, 2, 3, 4, 5]
78-
*/
79-
System.out.println(Arrays.toString(numbers));
80-
81-
82-
83-
String[] company = {"Google", "Facebook", "Amazon", "Microsoft"};
84-
85-
/*
86-
* company[0] = Google
87-
* company[1] = Facebook
88-
* company[2] = Amazon
89-
* company[3] = Microsoft
90-
*/
91-
for (int i = 0; i < company.length; i++) {
92-
System.out.println("company[" + i + "] = " + company[i]);
93-
}
94-
95-
/*
96-
* Google
97-
* Facebook
98-
* Amazon
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* Microsoft
100-
*/
101-
for (String c : company) {
102-
System.out.println(c);
103-
}
104-
105-
/*
106-
* [Google, Facebook, Amazon, Microsoft]
107-
*/
108-
System.out.println(Arrays.toString(company));
109-
110-
int[][] twoDimensionalNumbers = {
111-
{1, 2, 3},
112-
{4, 5, 6, 7},
113-
{8, 9},
114-
{10, 11, 12, 13, 14, 15}
115-
};
116-
117-
/*
118-
* total rows = 4
119-
*/
120-
System.out.println("total rows = " + twoDimensionalNumbers.length);
121-
122-
/*
123-
* row 0 length = 3
124-
* row 1 length = 4
125-
* row 2 length = 2
126-
* row 3 length = 6
127-
*/
128-
for (int i = 0; i < twoDimensionalNumbers.length; i++) {
129-
System.out.println("row " + i + " length = " + twoDimensionalNumbers[i].length);
130-
}
131-
132-
/*
133-
* row 0 = 1 2 3
134-
* row 1 = 4 5 6 7
135-
* row 2 = 8 9
136-
* row 3 = 10 11 12 13 14 15
137-
*/
138-
for (int i = 0; i < twoDimensionalNumbers.length; i++) {
139-
System.out.print("row " + i + " = ");
140-
for (int j = 0; j < twoDimensionalNumbers[i].length; j++) {
141-
System.out.print(twoDimensionalNumbers[i][j] + " ");
142-
}
143-
System.out.println();
144-
}
145-
146-
/*
147-
* row 0 = [1, 2, 3]
148-
* row 1 = [4, 5, 6, 7]
149-
* row 2 = [8, 9]
150-
* row 3 = [10, 11, 12, 13, 14, 15]
151-
*/
152-
for (int i = 0; i < twoDimensionalNumbers.length; i++) {
153-
System.out.println("row " + i + " = " + Arrays.toString(twoDimensionalNumbers[i]));
154-
}
155-
156-
/*
157-
* 1 2 3
158-
* 4 5 6 7
159-
* 8 9
160-
* 10 11 12 13 14 15
161-
*/
162-
for (int[] ints : twoDimensionalNumbers) {
163-
for (int num : ints) {
164-
System.out.print(num + " ");
165-
}
166-
System.out.println();
167-
}
168-
169-
/*
170-
* [1, 2, 3]
171-
* [4, 5, 6, 7]
172-
* [8, 9]
173-
* [10, 11, 12, 13, 14, 15]
174-
*/
175-
for (int[] ints : twoDimensionalNumbers) {
176-
System.out.println(Arrays.toString(ints));
177-
}
178-
179-
180-
int length = 5;
181-
int[] array = new int[length];
182-
for (int i = 0; i < 5; i++) {
183-
array[i] = i + 1;
184-
}
185-
186-
/*
187-
* [1, 2, 3, 4, 5]
188-
*/
189-
System.out.println(Arrays.toString(array));
7+
public static void main(String[] args) {
8+
int[] numbers = {1, 2, 3, 4, 5};
9+
10+
/*
11+
* numbers[0] = 1
12+
* numbers[1] = 2
13+
* numbers[2] = 3
14+
* numbers[3] = 4
15+
* numbers[4] = 5
16+
*/
17+
System.out.println("numbers[0] = " + numbers[0]);
18+
System.out.println("numbers[1] = " + numbers[1]);
19+
System.out.println("numbers[2] = " + numbers[2]);
20+
System.out.println("numbers[3] = " + numbers[3]);
21+
System.out.println("numbers[4] = " + numbers[4]);
22+
23+
/*
24+
* array index is out of bounds
25+
*/
26+
// System.out.println(numbers[-1]);
27+
// System.out.println(numbers[5]);
28+
29+
/*
30+
* numbers[0] = 1
31+
* numbers[1] = 2
32+
* numbers[2] = 3
33+
* numbers[3] = 4
34+
* numbers[4] = 5
35+
*/
36+
for (int i = 0; i < 5; i++) {
37+
System.out.println("numbers[" + i + "] = " + numbers[i]);
38+
}
39+
40+
/*
41+
* length of numbers = 5
42+
*/
43+
System.out.println("length of numbers = " + numbers.length);
44+
45+
/*
46+
* numbers[0] = 1
47+
* numbers[1] = 2
48+
* numbers[2] = 3
49+
* numbers[3] = 4
50+
* numbers[4] = 5
51+
*/
52+
for (int i = 0; i < numbers.length; i++) {
53+
System.out.println("numbers[" + i + "] = " + numbers[i]);
54+
}
19055

56+
/*
57+
* numbers[4] = 5
58+
* numbers[3] = 4
59+
* numbers[2] = 3
60+
* numbers[1] = 2
61+
* numbers[0] = 1
62+
*/
63+
for (int i = numbers.length - 1; i >= 0; i--) {
64+
System.out.println("numbers[" + i + "] = " + numbers[i]);
65+
}
66+
67+
/*
68+
* 12345
69+
*/
70+
for (int number : numbers) {
71+
System.out.print(number);
72+
}
73+
System.out.println();
74+
75+
/*
76+
* [1, 2, 3, 4, 5]
77+
*/
78+
System.out.println(Arrays.toString(numbers));
79+
80+
String[] company = {"Google", "Facebook", "Amazon", "Microsoft"};
81+
82+
/*
83+
* company[0] = Google
84+
* company[1] = Facebook
85+
* company[2] = Amazon
86+
* company[3] = Microsoft
87+
*/
88+
for (int i = 0; i < company.length; i++) {
89+
System.out.println("company[" + i + "] = " + company[i]);
19190
}
91+
92+
/*
93+
* Google
94+
* Facebook
95+
* Amazon
96+
* Microsoft
97+
*/
98+
for (String c : company) {
99+
System.out.println(c);
100+
}
101+
102+
/*
103+
* [Google, Facebook, Amazon, Microsoft]
104+
*/
105+
System.out.println(Arrays.toString(company));
106+
107+
int[][] twoDimensionalNumbers = {
108+
{1, 2, 3},
109+
{4, 5, 6, 7},
110+
{8, 9},
111+
{10, 11, 12, 13, 14, 15}
112+
};
113+
114+
/*
115+
* total rows = 4
116+
*/
117+
System.out.println("total rows = " + twoDimensionalNumbers.length);
118+
119+
/*
120+
* row 0 length = 3
121+
* row 1 length = 4
122+
* row 2 length = 2
123+
* row 3 length = 6
124+
*/
125+
for (int i = 0; i < twoDimensionalNumbers.length; i++) {
126+
System.out.println("row " + i + " length = " + twoDimensionalNumbers[i].length);
127+
}
128+
129+
/*
130+
* row 0 = 1 2 3
131+
* row 1 = 4 5 6 7
132+
* row 2 = 8 9
133+
* row 3 = 10 11 12 13 14 15
134+
*/
135+
for (int i = 0; i < twoDimensionalNumbers.length; i++) {
136+
System.out.print("row " + i + " = ");
137+
for (int j = 0; j < twoDimensionalNumbers[i].length; j++) {
138+
System.out.print(twoDimensionalNumbers[i][j] + " ");
139+
}
140+
System.out.println();
141+
}
142+
143+
/*
144+
* row 0 = [1, 2, 3]
145+
* row 1 = [4, 5, 6, 7]
146+
* row 2 = [8, 9]
147+
* row 3 = [10, 11, 12, 13, 14, 15]
148+
*/
149+
for (int i = 0; i < twoDimensionalNumbers.length; i++) {
150+
System.out.println("row " + i + " = " + Arrays.toString(twoDimensionalNumbers[i]));
151+
}
152+
153+
/*
154+
* 1 2 3
155+
* 4 5 6 7
156+
* 8 9
157+
* 10 11 12 13 14 15
158+
*/
159+
for (int[] ints : twoDimensionalNumbers) {
160+
for (int num : ints) {
161+
System.out.print(num + " ");
162+
}
163+
System.out.println();
164+
}
165+
166+
/*
167+
* [1, 2, 3]
168+
* [4, 5, 6, 7]
169+
* [8, 9]
170+
* [10, 11, 12, 13, 14, 15]
171+
*/
172+
for (int[] ints : twoDimensionalNumbers) {
173+
System.out.println(Arrays.toString(ints));
174+
}
175+
176+
int length = 5;
177+
int[] array = new int[length];
178+
for (int i = 0; i < 5; i++) {
179+
array[i] = i + 1;
180+
}
181+
182+
/*
183+
* [1, 2, 3, 4, 5]
184+
*/
185+
System.out.println(Arrays.toString(array));
186+
}
192187
}

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