Repository navigation
Expand file tree
/
Copy pathJavaLecture6.java
More file actions
89 lines (73 loc) · 3.4 KB
/
Copy pathJavaLecture6.java
File metadata and controls
89 lines (73 loc) · 3.4 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
// package com.rit;
public class JavaLecture6 {
public static void main(String[] args) {
// Types of Languages
// 1 - Statically-typed Languages (C/C++, Java, Scala, C#, Go, Rust, Dart, TS, Kotlin, ...)
// - Type checking at compile time
// 2 - Dynamically-typed Languages (PHP, Perl, Lua, R, Ruby, JS, Python, Julia, ...)
// - Type checking at runtime
// Java Data Types
// All Java Data-Types are separated into two groups:
// 1 - Primitive types or Value types or Simple types
// 2 - References types or Non-Primitive types or Object types or Complex types
// 1 - Primitive types (storing simple values)
// - Java has 8 primitive data types. They can be divided into 4 groups:
// - Integer Numbers: byte, short, int, long
// - Floating-Point Numbers: float, double
// - Logical Type: boolean
// - Characters: char
// - The most used primitive types are "int", "long", "double", "boolean", and "char".
// 2 - References types (storing complex structure/objects)
// - String
// - Objects
// - Arrays
// - Classes
// - Interfaces
// Sizes and Ranges of Primitive types
// boolean: It represents only 1-bit of information, but its size is not something that's precisely defined. true or false
// byte: the size is 08-bits (1 byte ), the range is from -128 to 127
// char: the size is 16-bits (2 bytes), the range is from 0 to 65536 (unsigned)
// short: the size is 16-bits (2 bytes), the range is from -32768 to 32767
// int: the size is 32-bits (4 bytes),
// long: the size is 64-bits (8 bytes),
// float: the size is 32-bits (4 bytes), approximately 6-7 significant decimal digits
// double: the size is 64-bits (8 bytes), approximately 14-16 significant decimal digits
// Default Values of Primitive types
// boolean - false
// char - \u0000
// byte, short, int, long - 0
// float, double - 0.0
// Primitive types Variables
byte age = 26;
short s = 5569;
int v1 = 712928;
long v2 = 32_754_921L;
long v3 = 4242L;
int decNum = 190;
int octNum = 0457;
int hexNum = 0xFA;
int binNum = 0b1101;
int minInt = Integer.MIN_VALUE;
int maxInt = Integer.MAX_VALUE;
float p1 = 424.42F;
double p2 = 3523184.428d;
double eps = 5e-3; // 5 * 10^(-3) = 0.0005
// System.out.println(Double.SIZE); // 64-bits
double minDbl = Double.MIN_VALUE;
double maxDbl = Double.MAX_VALUE;
char ch = 'C';
char b = 'a' + 1; // the 'b' character
char d = 'b' + 2; // the 'd' character
char ch1 = 101; // the 'e' character
char ch2 = '\u0040'; // the '@' character
boolean r1 = true;
boolean r2 = false;
boolean r3 = 5 > 2;
// References types Variables
String msg1 = "Java Programming ";
String msg2 = new String("Hi Java String");
String newStr = msg1.concat("for Android");
System.out.println(newStr);
// Happy Learning :)
}
}