This repository was archived by the owner on Mar 13, 2026. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathArrayListMethods2.java
More file actions
97 lines (66 loc) · 2.36 KB
/
Copy pathArrayListMethods2.java
File metadata and controls
97 lines (66 loc) · 2.36 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
package day28_ArrayList;
import java.util.ArrayList;
import java.util.Arrays;
public class ArrayListMethods2 {
public static void main(String[] args) {
ArrayList<Integer> list = new ArrayList<>();
list.add(100);
list.add(200);
list.add(200);
list.add(200);
list.add(300);
list.add(400);
list.add(500);
System.out.println(list);
/*
int num = 1;
list.remove(num);
*/
Integer num = 2000;
//list.remove(200);
boolean r = list.remove(num);
System.out.println(list);
System.out.println(r);
System.out.println("-----------------------------------------");
System.out.println(list.size());
list.clear();
System.out.println(list.size());
System.out.println(list);
System.out.println("-----------------------------------------");
ArrayList<Character> characters = new ArrayList<>();
characters.add('A');
characters.add('A');
characters.add('A');
characters.add('A');
characters.add('A');
int a = characters.indexOf('A'); //0
int b = characters.lastIndexOf('A'); //4
System.out.println(a);
System.out.println(b);
System.out.println("--------------------------------------------");
boolean r2 = characters.contains('A');
boolean r3 = characters.contains('Z');
System.out.println("r2 = " + r2);
System.out.println("r3 = " + r3);
System.out.println("--------------------------------");
ArrayList<Integer> list1 = new ArrayList<>();
list1.add(100);
list1.add(100);
list1.add(100);
ArrayList<Integer> list2 = new ArrayList<>();
list2.add(100);
list2.add(100);
list2.add(100);
System.out.println(list1 == list2);
System.out.println(list1.equals(list2));
System.out.println("-----------------------------------------");
list1.clear();
boolean r4 = list1.isEmpty(); // true
System.out.println("r4 = " + r4);
System.out.println("----------------------------------");
ArrayList<Integer> numbers = new ArrayList<>();
//Bulk Operation: CollectionType
numbers.addAll( Arrays.asList(1,2,3,4,5,6,7) );
System.out.println(numbers);
}
}