Learn Python! Comparison with Java (basic function)
Introduction
Now that I've started learning Python, I'd like to compare it with the Java I've learned.
print function
print('Hello')
print("Hello")
Execution result
For Java
System.out.println("Hello");
Comment out
#Comment out
print('No comments are displayed')
For Java
//Comment out
System.out.println("No comments are displayed");
variable
name = 'Sato'
age = '20'
print(name)
print(age)
Execution result
For Java
String name = "Sato";
int age = 20;
System.out.println(name);
System.out.println(age);
input function
name = input('Please enter your name>>')
age = input('Please enter your age>>')
print(name)
print(age)
Execution result
For Java
System.out.println("Please enter your name");
String name = new java.util.Scanner(System.in).nextLine();
System.out.println("Please enter your name");
int age = new java.util.Scanner(System.in).nextInt();
System.out.println(name);
System.out.println(age);
* Numbers entered by the input function are treated as str (character string), so the following data type conversion is required </ font>
Data type conversion
Convert from str type to int type
#Substitute the string "1" for x
x = '1'
#Convert string "1" to integer "1"
y = int(x)
#Calculate between integers
print(y + 1)
Execution result
For Java
//Substitute the string "1" for x
String x = "1";
//Convert string "1" to integer "1"
int y = Integer.parseInt(x);
//Calculation between integers
System.out.println(y + 1);
Convert from int type to str type
#Substitute the integer "1" for x
x = 1
#Convert integer "1" to string "1"
y = str(x)
#Concatenation of strings
print(y + '1')
Execution result
For Java
//Substitute the string "1" for x
int x = 1;
//Convert integer "1" to string "1"
String y = String.valueOf(x);
//Concatenation of strings
System.out.println(y + "1");
typ function
Examine the data type of a value in a variable
a = 'Hello'
b = 1
print(type(a))
print(type(b))
Execution result
format function
Embed a number in a string
name = 'Sato'
age = 20
print('my name is{}is. Age is{}I'm old.'.format(name, age))
Or
name = 'Sato'
age = 20
print(f'my name is{name}is. Age is{age}I'm old.')
Execution result
For Java
String name = "Sato";
int age = 20;
String str = String.format("my name is%s. Age is%I'm d years old.", name, age);
System.out.println(str);
References
https://book.impress.co.jp/books/1118101169
Next time, I would like to learn about the collection.
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