Java Strings Tutorial | String Manipulation in Java | Java Tutorial For Beginners | Edureka
3 likes894 views
The document provides an overview of Java strings, highlighting their immutability and the use of the java.lang.String class to create and manipulate them. It discusses the string pool concept, showing how strings are stored in heap memory and reused for efficiency. Additionally, it outlines key string methods and differences between String, StringBuffer, and StringBuilder.
Java Strings Tutorial | String Manipulation in Java | Java Tutorial For Beginners | Edureka
- 2. Java String Creating a String Hands On String Pool String Methods
- 3. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java String Object 01 String is a Java object Characters 02 Class 03 Immutable 04 Represents a sequence of characters java.lang.String class is used to create and manipulate strings A string is immutable in nature
- 4. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training The quick brown fox jumps over the lazy dogThe quick brown fox jumps over the lazy dog The quick fox jumps The quick lazy dog Java Strings The quick brown fox jumps over the lazy dogSearch Create Substring Create new strings The quick brown fox jumps over the lazy dog With Strings in Java you can perform various operations, some of which are:
- 5. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Strings java.lang.String
- 6. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Strings java.lang.String ComparableSerializable CharSequence public final class String extends Object implements Serializable, Comparable<String>, CharSequence
- 7. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Comparable interface is used for ordering the objects of any user-defined class. This interface is found in java.lang.package and contains only one method named compareTo(Object) A CharSequence interface is a readable sequence of characters. This interface provides uniform, read-only access to various kind of character sequences Serializable is a marker interface that contains no data member or method. It is used to “mark” the java classes so that objects of these classes may get a specific capability Java Strings Comparable Serializable CharSequence
- 8. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training java,lang.StringBuffer is a peer class of String that represents growable and writable character sequences java.lang.StringBuilder is identical to StringBuffer except for one important difference that it is not synchronized, which means it is not thread safe java.lang.String class is used to create string objects and provides a list of methods to create and manipulate Strings Java Strings CharSequence String StringBuffer StringBuilder
- 9. String Pool
- 10. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training String Pool Java String pool refers to collection of Strings which are stored in heap memory As String objects are immutable in nature the concept of String Pool came into the picture String Pool helps in saving space for Java Runtime Heap Memory String Pool
- 12. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Literal new Keyword Creating a String – Using Literal Java String literal is created by using double quotes String str = “Edureka”; Heap Memory String Pool Edureka str str1 String str2 = “Welcome”;str2 Welcome String str1 = “Edureka”; Before creating a String literal first looks for String with same value in the String pool, if found it returns the reference else it creates a new String in the pool & returns the reference
- 13. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Literal new Keyword Creating a String – Using new Keyword Heap Memory String Pool Edureka Welcome str str1 str2 Edureka str3 String object created using “new” keyword it always create a new object in heap memory String str = new String (“Edureka”);
- 14. String Methods
- 15. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training String Methods boolean equals(Object another) Checks the equality of string with the given object equalsIgnoreCase() Compares another string without matching the case length() Returns a strings length charAt(i) Returns a character at a index ‘i’ toUpperCase() Returns the string in uppercase toLowerCase() Returns the string in lowercase replace(oldVal, newVal) Replaces all occurrences of the specified char value with the given value trim() Removes the white spaces from the beginning and ending of string contains("value") Checks for the matching sequence of char value and returns true/false toCharArray() Converts a string to a new character array IsEmpty() Checks whether the string is empty or not endsWith() Checks if the string ends with the specified suffix concat() Concatenates two strings