java.lang.String Class
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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.
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![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);](https://image.slidesharecdn.com/stringclass-171102092428/85/java-lang-String-Class-1-320.jpg)
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2. **Object-Oriented Programming (OOP)**:
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- These principles enable developers to create modular and reusable code.
3. **Rich Ecosystem and Libraries**:
- Java has a vast ecosystem of libraries, frameworks, and tools that facilitate development across various domains.
- Popular frameworks like Spring, Hibernate, and Apache Struts streamline development in enterprise environments.
4. **Robustness and Reliability**:
- Java has strong exception handling and type-checking mechanisms that contribute to the robustness and reliability of applications.
5. **Community and Support**:
- Java has a large and active developer community, providing support and resources for learning and troubleshooting.
- Java's extensive documentation and community forums are valuable resources for developers.
6. **Performance**:
- Java's just-in-time (JIT) compilation allows for optimized execution, improving performance.
- Java can handle large-scale applications and complex computations efficiently.
7. **Security**:
- Java's architecture includes features such as runtime security checks and a security manager for safe execution.
- This makes it a preferred choice for developing secure applications.
8. **Enterprise Applications**:
- Java is a dominant language in enterprise development due to its scalability, stability, and compatibility with existing systems.
- Many businesses rely on Java for mission-critical applications.
9. **Career Opportunities**:
- Proficiency in Java opens up many career opportunities, particularly in enterprise development, finance, healthcare, and telecommunications.
10. **Future-Proofing**:
- Java's continuous updates and compatibility with emerging technologies ensure that it remains relevant and future-proof.
Overall, Java's versatility, reliability, and widespread adoption make it an essential language for developers across various industries
Strings in c
This document provides an overview of string handling in C programming. It discusses how strings are represented as character arrays and terminated with a null character. It describes declaring, initializing, and manipulating strings through built-in string functions like strlen(), strcpy(), strcmp(), strcat(), strlwr(), and strrev(). Examples are given to illustrate how each string function works and how to use them to process strings as complete entities.
Arrays string handling java packages
This document discusses arrays, strings, and string buffers in Java. It covers:
- Creating and initializing arrays, including single and multi-dimensional arrays
- Common string operations like length(), concatenation, character extraction, comparison, searching, and modifying case
- Constructing and modifying mutable string buffers, which can be changed unlike immutable string objects
- The main method parameter which is an array of command line arguments
Similar to java.lang.String Class (20)
In the given example only one object will be created. Firstly JVM will not fi...
In the given example only one object will be created. Firstly JVM will not fi...
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HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAU
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
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Overview
Dive into the world of anomaly detection on edge devices with our comprehensive hands-on tutorial. This SlideShare presentation will guide you through the entire process, from data collection and model training to edge deployment and real-time monitoring. Perfect for those looking to implement robust anomaly detection systems on resource-constrained IoT/edge devices.
Key Topics Covered
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2. Understanding Edge (IoT)
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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();