java String class of commonly used functions

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1. Obtain

int indexOf(int c)

int indexOf(int c, int start)

char charAt(int index)

2. judge

It determines whether a string contains

boolean contains(CharSequence cs)

indexOf () // it may also be used to determine whether comprising

Determine whether there is content

boolean isEmpty () // determine whether there is content

In order to determine whether the end of the specified content

boolearn endsWith ( )

Analyzing the content of the string is the same

boolearn equals () // method overrides Object

Determine whether the same content, and ignore case

boolearn equalsIgnoreCase( )

3. Conversion

It will turn into a string array of characters:

Constructor:

String(char[] data)

String (char [] data, int offset, int charCount) // turn portion of the array of characters to a string

Static methods:

• static String copyValueOf(char[] data, int start, int length)
• static String copyValueOf(char[] data) static String
• valueOf(char[] data)

String transformed into an array of characters

char[] toCharArray()

The byte array translated into strings String (byte [] data)

Turn the string into a byte array

byte[] getBytes()

The basic data types into a string

static String valueOf(int value)

4. Replace

Note: string can not be changed

String replace (char oldChar, char newChar) // returns the new string

5. Cutting

String [] split (String regularExpression) // returns an array of strings

6. substring string acquisition portion

String substring (int start) // string from the beginning to the final

String substring (int start, int end) // includes head, without trailing

7. Conversion removing spaces, more

Case conversion

• String toUpperCase()
• String toLowerCase()

Remove excess spaces

String trim () // remove the spaces at both ends

Comparing two strings natural order

int compareTo(String string)

Reproduced in: https: //my.oschina.net/itfanr/blog/195666