Java string , string buffer and wrapper class

Aug 23, 2018Download as pptx, pdf

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The document discusses Java strings and wrapper classes. It provides examples of creating and manipulating strings using the String, StringBuffer, and StringBuilder classes. It also discusses the eight primitive wrapper classes in Java and examples converting between primitive types and their corresponding wrapper classes.

Java string , string buffer and wrapper class

Java String class provides a lot of methods to perform operations on string such as
compare(), concat(), equals(), split(), length(), replace(), compareTo(), intern(), substring()
etc.
String
The CharSequence interface is used to represent the sequence of characters. String,
StringBuffer and StringBuilder classes implement it. It means, we can create strings in
java by using these three classes.
public class StringExample{
public static void main(String args[]){
String s1="java";//creating string by java string literal
char ch[]={'s','t','r','i','n','g','s'};
String s2=new String(ch);//converting char array to string
String s3=new String("example");//creating java string by new keyword
System.out.println(s1);
System.out.println(s2);
System.out.println(s3);
}}
Output :
java strings example

Most read

Java StringBuffer class is used to create mutable (modifiable) string. The StringBuffer
class in java is same as String class except it is mutable i.e. it can be changed.
Java StringBuffer class is thread-safe i.e. multiple threads cannot access it simultaneously.
So it is safe and will result in an order.
Java StringBuffer class
Constructor Description
StringBuffer() creates an empty string buffer with the initial capacity of
16.
StringBuffer(String str) creates a string buffer with the specified string.
StringBuffer(int capacity) creates an empty string buffer with the specified capacity
as length.
Important Constructors of StringBuffer class

StringBuffer examples
Some of the methods of stringbuffer class is as follows:
1. StringBuffer append() method
The append() method concatenates the given argument with this string.
class StringBufferExample{
public static void main(String args[]){
StringBuffer sb=new StringBuffer("Hello ");
sb.append("Java");//now original string is changed
System.out.println(sb);//prints Hello Java
}
}

2) StringBuffer insert() method
The insert() method inserts the given string with this string at the given position.
class StringBufferExample2{
public static void main(String args[]){
StringBuffer sb=new StringBuffer("Hello ");
sb.insert(1,"Java");//now original string is changed
System.out.println(sb);//prints HJavaello
}
}
3) StringBuffer replace() method
The replace() method replaces the given string from the specified beginIndex and endIndex.
class StringBufferExample3{
public static void main(String args[]){
StringBuffer sb=new StringBuffer("Hello");
sb.replace(1,3,"Java");
System.out.println(sb);//prints HJavalo
}
}
Conti.

4) StringBuffer delete() method
The delete() method deletes the string from the specified beginIndex to endIndex.
class StringBufferExample4{
public static void main(String args[]){
StringBuffer sb=new StringBuffer("Hello");
sb.delete(1,3);
System.out.println(sb);//prints Hlo
}
}
5) StringBuffer reverse() method
The reverse() method of StringBuffer class reverses the current string.
class StringBufferExample5{
public static void main(String args[]){
StringBuffer sb=new StringBuffer("Hello");
sb.reverse();
System.out.println(sb);//prints olleH
}
}

Wrapper class in Java
Wrapper class in java provides the mechanism to convert primitive
into object and object into primitive.
The eight classes of java.lang package are known as wrapper classes
in java. The list of eight wrapper classes are given below:
Primitive type Wrapper class
boolean Boolean
int Integer
byte Byte
short Short
char Charcter
long Long
float Float
double Double

Wrapper class Example: Primitive to Wrapper
public class WrapperExample1{
public static void main(String args[]){
//convert primitive into object type
int a=20;
Integer i=Integer.valueOf(a); //converting int into Integer
System.out.println(“printing as primitive type "+a);
System.out.println(“printing as object: ” + i)
}}
Output:
20 20

Wrapper class Example: Primitive to Wrapper
public class WrapperExample2{
public static void main(String args[]){
//Converting Integer to int
Integer a=new Integer(3);
int i=a.intValue(); //converting Integer to int
System.out.println(“printing as object "+a);
System.out.println(“printing as primitive type ” + i)
}}
Output:
3 3 3

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The document discusses the merge sort algorithm. Merge sort works by recursively dividing an unsorted list in half until each sublist contains one element, and then merging the sublists back together in sorted order. This can be done by dividing the list, sorting each half via recursive calls, and then using a merge process to combine the now-sorted halves into a fully sorted list. The document provides examples of merging two sorted lists and walking through the full merge sort process on a sample input list. It analyzes the time complexity of merge sort as O(n log n) and discusses in-place versus double-storage implementations.

JDBC Architecture and DriversSimoniShah6

This document discusses JDBC architecture and driver types. It introduces JDBC as an API that allows Java applications to connect to databases. The JDBC architecture involves using driver classes like DriverManager and Connection to communicate with a database through a specific driver. There are four types of JDBC drivers: type 1 uses JDBC-ODBC bridge, type 2 uses native database APIs, type 3 uses a middleware, and type 4 is a pure Java driver that connects directly to the database.

Modulation TechniquesSimoniShah6

The document discusses three types of modulation techniques: amplitude modulation, frequency modulation, and phase modulation. Amplitude modulation varies the amplitude of the carrier signal while keeping frequency and phase constant. Frequency modulation varies the frequency of the carrier signal while keeping amplitude and phase constant. Phase modulation varies the phase of the carrier signal while keeping amplitude and frequency constant. Each modulation technique has advantages and disadvantages related to power consumption, bandwidth requirements, and applications such as radio waves, television, and satellite communication.

Top 10 Hadoop Shell Commands SimoniShah6

The document discusses Hadoop shell commands for interacting with the Hadoop Distributed File System (HDFS). It provides the syntax and examples of 10 common commands: 1) hadoop version, 2) mkdir, 3) ls, 4) cat, 5) mv, 6) cp, 7) rm, 8) put, 9) get, and 10) tail. These commands allow users to create directories, list contents, display files, move/copy files, remove files, upload/download files between local file system and HDFS, and view the last lines of a file.

Arrays and PointersSimoniShah6

This document discusses pointers and arrays in computer programming. It defines pointers as variables that contain the memory address of another variable. Arrays are collections of similar data items with a fixed size. Pointer variables can contain the address of an array element. An array name is like a constant pointer. The document provides an example of an integer array and using a pointer variable to traverse the array elements by address. It also discusses using pointers to dynamically allocate arrays of strings to save memory compared to fixed-length character arrays.

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MergesortSimoniShah6

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Java string , string buffer and wrapper class

2. Java String class provides a lot of methods to perform operations on string such as compare(), concat(), equals(), split(), length(), replace(), compareTo(), intern(), substring() etc. String The CharSequence interface is used to represent the sequence of characters. String, StringBuffer and StringBuilder classes implement it. It means, we can create strings in java by using these three classes. public class StringExample{ public static void main(String args[]){ String s1="java";//creating string by java string literal char ch[]={'s','t','r','i','n','g','s'}; String s2=new String(ch);//converting char array to string String s3=new String("example");//creating java string by new keyword System.out.println(s1); System.out.println(s2); System.out.println(s3); }} Output : java strings example

3. Java StringBuffer class is used to create mutable (modifiable) string. The StringBuffer class in java is same as String class except it is mutable i.e. it can be changed. Java StringBuffer class is thread-safe i.e. multiple threads cannot access it simultaneously. So it is safe and will result in an order. Java StringBuffer class Constructor Description StringBuffer() creates an empty string buffer with the initial capacity of 16. StringBuffer(String str) creates a string buffer with the specified string. StringBuffer(int capacity) creates an empty string buffer with the specified capacity as length. Important Constructors of StringBuffer class

4. StringBuffer examples Some of the methods of stringbuffer class is as follows: 1. StringBuffer append() method The append() method concatenates the given argument with this string. class StringBufferExample{ public static void main(String args[]){ StringBuffer sb=new StringBuffer("Hello "); sb.append("Java");//now original string is changed System.out.println(sb);//prints Hello Java } }

5. 2) StringBuffer insert() method The insert() method inserts the given string with this string at the given position. class StringBufferExample2{ public static void main(String args[]){ StringBuffer sb=new StringBuffer("Hello "); sb.insert(1,"Java");//now original string is changed System.out.println(sb);//prints HJavaello } } 3) StringBuffer replace() method The replace() method replaces the given string from the specified beginIndex and endIndex. class StringBufferExample3{ public static void main(String args[]){ StringBuffer sb=new StringBuffer("Hello"); sb.replace(1,3,"Java"); System.out.println(sb);//prints HJavalo } } Conti.

6. 4) StringBuffer delete() method The delete() method deletes the string from the specified beginIndex to endIndex. class StringBufferExample4{ public static void main(String args[]){ StringBuffer sb=new StringBuffer("Hello"); sb.delete(1,3); System.out.println(sb);//prints Hlo } } 5) StringBuffer reverse() method The reverse() method of StringBuffer class reverses the current string. class StringBufferExample5{ public static void main(String args[]){ StringBuffer sb=new StringBuffer("Hello"); sb.reverse(); System.out.println(sb);//prints olleH } }

7. Wrapper class in Java Wrapper class in java provides the mechanism to convert primitive into object and object into primitive. The eight classes of java.lang package are known as wrapper classes in java. The list of eight wrapper classes are given below: Primitive type Wrapper class boolean Boolean int Integer byte Byte short Short char Charcter long Long float Float double Double

8. Wrapper class Example: Primitive to Wrapper public class WrapperExample1{ public static void main(String args[]){ //convert primitive into object type int a=20; Integer i=Integer.valueOf(a); //converting int into Integer System.out.println(“printing as primitive type "+a); System.out.println(“printing as object: ” + i) }} Output: 20 20

9. Wrapper class Example: Primitive to Wrapper public class WrapperExample2{ public static void main(String args[]){ //Converting Integer to int Integer a=new Integer(3); int i=a.intValue(); //converting Integer to int System.out.println(“printing as object "+a); System.out.println(“printing as primitive type ” + i) }} Output: 3 3 3

Java string , string buffer and wrapper class

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