Java: Strings

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 = "Hello\nWorld!"; System.out.println(txt); // Outputs  Hello World!
\r	Carriage Return	String txt = "Hello\rWorld!"; System.out.println(txt); // Outputs  Hello World!
\t	Tab	String txt = "Hello\tWorld!"; System.out.println(txt); // Outputs  Hello    World!
\b	Backspace	String txt = "Hel\blo World!"; System.out.println(txt); // Outputs  Helo World!