Java: Strings | 程序员灯塔

String Methods:

String txt = "Hello World";
System.out.println(txt.toUpperCase());   // Outputs "HELLO WORLD"
System.out.println(txt.toLowerCase());   // Outputs "hello world"

String txt = "Please locate where 'locate' occurs!";
System.out.println(txt.indexOf("locate")); // Outputs 7

System.out.println(txt.indexOf("p")); // Outputs 0
System.out.println(txt.indexOf("l")); // Outputs 1

String firstName = "John ";
String lastName = "Doe";
System.out.println(firstName.concat(lastName));

String x = "10";
String y = "20";
String z = x + y;  // z will be 1020 (a String)

String x = "10";
int y = 20;
String z = x + y;  // z will be 1020 (a String)

Special Characters

Escape character	Result	Description
'	'	Single quote
"	"	Double quote
\		Backslash

Code	Result
n	New Line	String txt = "HellonWorld!"; System.out.println(txt); // Outputs Hello World!
r	Carriage Return	String txt = "HellorWorld!"; System.out.println(txt); // Outputs Hello World!
t	Tab	String txt = "HellotWorld!"; System.out.println(txt); // Outputs Hello World!
b	Backspace	String txt = "Helblo World!"; System.out.println(txt); // Outputs Helo World!

程序员灯塔
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