java.lang.String Class

Nov 2, 20170 likes137 views

The document summarizes common methods of the String class in Java. It describes methods for creating String objects, finding lengths, converting to other data types, checking for equality, extracting substrings, modifying case, and more. Key methods include length(), toString(), getBytes(), equals(), substring(), trim(), toUpperCase(), and toLowerCase(). The String class in Java provides many useful methods for manipulating and working with String objects.

java.lang.String class
In Java a String is an object of class java.lang.String and we can make the string objects by calling String
constructors. The constructors of java.lang.String classes are overloaded some of them are

Creating an empty String
String s = new String();
Creating a string with character array
String fromCharArray = new String(char[] arr);
Creating a string from character array with specified index and number of characters
String fromCharArray = new String(char[], int startIndex, int numberOfCharacters);
Creating a string from another string
String copy = new String(String s);

Methods of java.lang.String class

length()
The method length is used to find the length of a String object.
Declaration
public int length();
Usage
String s = “Alex Vipul Verma”;
int len = s.length();
toString()
The method toString() is an instance method of Object class and overridden by most of the classes
in Java API. It is used to convert any reference data type into String for readable from
Declaration
public String toString();
Usage
Object ob = new Object();
String s = ob.toString();

getBytes()
The method getBytes() is used to create a byte array from the String with the ASCII values of
individual characters
Declaration
public byte[] getBytes();
Usage
String s = “ABCD”;
byte[] arr = new byte[s.length()];
arr = s.getBytes();
Here the array arr is generated as
byte arr = {65, 66, 67, 68};
toCharArray()
The method toCharArray() is similar to getBytes(). The method getBytes() generates the byte type
array and char Array generates char type array
Declaration
public char[] toCharArray();
Usage
String s = “Hello!”;
char[] arr = new char[s.length];
arr = s.toCharArray();
Here the character array arr is generated as
char arr = {‘h’, ‘e’, ‘l’, ‘l’, ‘o’, ‘!’};

equals() and equalsIgnoreCase()
The method equals() is used to check the equality of two given strings. It returns true if the
strings are equal. equalsIgnoreCase() is similar to equals() but it ignore the cases of strings
Declaration
public boolean equals(String s);
public boolean equalsIgnoreCase(String s);
Usage
boolean result1 = “Alex”.equals(“Alex”);
boolean result2 = “Hello”.equals(“HELLO”);
startsWith() and endsWith()
These two methods are overloaded. They are used to check whether a String is starting (or ending)
with specified character or NOT
Declaration
public boolean startsWith(char ch);
public boolean startsWith(String s);
public boolean endsWith(char ch);
public boolean startsWith(String s);

charAt(index)
The method charAt() is used to find the character at the specified index from a String
Declaration
public char charAt(int index);
Usage
String s = “Alex Vipul Verma”;
char ch = s.charAt(10);
indexOf() and lastIndexOf()
These two methods are also overloaded to take string and character type parameter. They are used
to get the index of specified character or string into the existing string. They return -1 if the
argument did NOT found into the calling String.
Declaration
public int indexOf(char ch);
public int indexOf(String s);
public int lastIndexOf(char ch);
public int lastIndexOf(String s);

substring()
substring() is an overloaded method. Used to create a substring from another string. It is helpful
to obtain a copy of string with the specified number of characters and starting index
Declaration
public String substring(int startIndex);
public String substring(int startIndex, endIndex);
trim()
The method trim() is used to remove the unnecessary whitespaces from a given string.
Declaration
public String trim();
toUpperCase() and toLowerCase()
These two methods are used to convert all the characters of a string to uppercase or lowercase.
The String objects are immutable so they do NOT modify the existing String but they return a copy
of modified String.
Declaration
public String toUpperCase();
public String toLowerCase();

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java.lang.String Class

1. java.lang.String class In Java a String is an object of class java.lang.String and we can make the string objects by calling String constructors. The constructors of java.lang.String classes are overloaded some of them are Creating an empty String String s = new String(); Creating a string with character array String fromCharArray = new String(char[] arr); Creating a string from character array with specified index and number of characters String fromCharArray = new String(char[], int startIndex, int numberOfCharacters); Creating a string from another string String copy = new String(String s);

2. Methods of java.lang.String class length() The method length is used to find the length of a String object. Declaration public int length(); Usage String s = “Alex Vipul Verma”; int len = s.length(); toString() The method toString() is an instance method of Object class and overridden by most of the classes in Java API. It is used to convert any reference data type into String for readable from Declaration public String toString(); Usage Object ob = new Object(); String s = ob.toString();

3. getBytes() The method getBytes() is used to create a byte array from the String with the ASCII values of individual characters Declaration public byte[] getBytes(); Usage String s = “ABCD”; byte[] arr = new byte[s.length()]; arr = s.getBytes(); Here the array arr is generated as byte arr = {65, 66, 67, 68}; toCharArray() The method toCharArray() is similar to getBytes(). The method getBytes() generates the byte type array and char Array generates char type array Declaration public char[] toCharArray(); Usage String s = “Hello!”; char[] arr = new char[s.length]; arr = s.toCharArray(); Here the character array arr is generated as char arr = {‘h’, ‘e’, ‘l’, ‘l’, ‘o’, ‘!’};

4. equals() and equalsIgnoreCase() The method equals() is used to check the equality of two given strings. It returns true if the strings are equal. equalsIgnoreCase() is similar to equals() but it ignore the cases of strings Declaration public boolean equals(String s); public boolean equalsIgnoreCase(String s); Usage boolean result1 = “Alex”.equals(“Alex”); boolean result2 = “Hello”.equals(“HELLO”); startsWith() and endsWith() These two methods are overloaded. They are used to check whether a String is starting (or ending) with specified character or NOT Declaration public boolean startsWith(char ch); public boolean startsWith(String s); public boolean endsWith(char ch); public boolean startsWith(String s);

5.   charAt(index) The method charAt() is used to find the character at the specified index from a String Declaration public char charAt(int index); Usage String s = “Alex Vipul Verma”; char ch = s.charAt(10); indexOf() and lastIndexOf() These two methods are also overloaded to take string and character type parameter. They are used to get the index of specified character or string into the existing string. They return -1 if the argument did NOT found into the calling String. Declaration public int indexOf(char ch); public int indexOf(String s); public int lastIndexOf(char ch); public int lastIndexOf(String s);

6. substring() substring() is an overloaded method. Used to create a substring from another string. It is helpful to obtain a copy of string with the specified number of characters and starting index Declaration public String substring(int startIndex); public String substring(int startIndex, endIndex); trim() The method trim() is used to remove the unnecessary whitespaces from a given string. Declaration public String trim(); toUpperCase() and toLowerCase() These two methods are used to convert all the characters of a string to uppercase or lowercase. The String objects are immutable so they do NOT modify the existing String but they return a copy of modified String. Declaration public String toUpperCase(); public String toLowerCase();

java.lang.String Class

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