Various methods of Java String class

Method related to string inspection

Method	operation	Argument type	Return type
equals	Check if the contents are equal	String	boolean
equalsIgnoreCase	Check if the content is equal, ignoring case	String	boolean
length	Check the length of the string	String	int
isEmpty	Check if it is an empty string	String	int

Methods for string search

Method	operation	Argument type	Return type
contains	Find out if it contains a string	String	boolean
startsWith	Find out if it starts with the specified string	String	boolean
endsWith	Checks if it ends with the specified string	String	boolean
indexOf	Find out where the specified character or string first appears	String	int
lastIndexOf	Search from the back for the specified character or string to find out where it first appears	String	int

Method related to string clipping

Method	operation	Argument type	Return type
charAt	Cut out one character at the specified position	int	String
startsWith	Checks if it starts with the specified string	String	boolean
endsWith	Checks if it ends with the specified string	String	boolean
indexOf	Find out where the specified character or string first appears	String	int
lastIndexOf	Search from the back for the specified character or string to find out where it first appears	String	int

Methods for string conversion

Method	operation	Argument type	Return type
toLowerCase	Convert uppercase to lowercase	String	String
toUpperCase	Convert uppercase to lowercase	String
trim	Remove leading and trailing whitespace	String
replace	Replace with the specified string	String,String	String
reverse	Invert the specified string	String

References

Java introductory practice that you can understand clearly

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