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1. Top results related to java api string methods

   • Java String startsWith() and endsWith() Methods With Examples

     The String class in Java is an immutable and non-primitive data type that is used to store the characters of the sequence. The string is non-primitive datatype because, during the initialization of the string variable, it refers to an object that contains methods that can perform several different kinds of operations, but according to the definition of the primitive datatype, they are not considered as the object and store the data in the stack memory. In this article, we will discuss the endsWith() method and the startsWith() method of the String class in java.

     Let us discuss both the methods individually:

     • endsWith() Method in java
     • startsWith() Method

     Method 1: endsWith() method 

     This method of the String class checks whether the given string ends with the specified string suffix or not.

     Syntax:

     endsWith(String suffix)

     Parameter: This method takes one parameter that is of string type..

     Return type: This method returns a boolean value true or false. the i.e string ends with a specified suffix or not.

     Example:

     Java

     // Java Program to illustrate endsWith() Method // Importing required classesimport java.io.*; Main class...

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     1/5

   • Java REST API return JSON from string

     Top Answer

     Answered Apr 21, 2016 · 0 votes

     I had a similar requirement, but what I did was just to serialized it from the Gson to the entity to handle it internally, and when print it or save it, just serializes it back to GSON, the logic is something like this (by the way, I used Gson for both ways):

     import com.google.gson.Gson;import com.google.gson.GsonBuilder;import com.data.repository;import com.data.Entity;import javax.ws.rs.GET;import javax.ws.rs.Path;import javax.ws.rs.PathParam;import javax.ws.rs.Produces;import javax.ws.rs.core.Response;@Path("/rest")public class RestService { /* ... Other calls */ private String toJson(Object entity) { Gson gson = new GsonBuilder() .setDateFormat("yyyy-MM-dd HH:mm:ss.SSS zzz") .setPrettyPrinting() .create(); String result = gson.toJson(entity); return result.replace("\\\"", ""); } @GET @Path("/{param1}/{param2}") @Produces({"application/xml", "application/json", "text/plain", "text/html"}) public Response getEntity(@PathParam("param1") String param1, @PathParam("param2") String param2) { Entity entity = repository.getEntity(param1, param2); if (entity == null) { return Response .status(Response.Status.NOT_FOUND) .entity( String.format( "param1 %s does not have a valid record for param2 %s", param1, param2)) .build(); } return Response.ok(this.toJson(entity)).build(); }}

     And here the entity:

     import com.google.gson.Gson;import com.google.gson.annotations.SerializedName;-import java.util.Date;public class Entity { @SerializedName("Field1") private String field1; @SerializedName("Field2") private int field2; @SerializedName("Field3") private int field3; @SerializedName("Field4") private Date field4; public Entity() { } /* ... ... Gets and Sets ... */ @Override public String toString() { Gson gson = new Gson(); String json = gson.toJson(this, Entity.class); return json; }}

     And the logic to get the json and translate it to the entity is as simple as this:

     Gson gson = new Gson();Entity repoSequence = gson.fromJson(jsonString, Entity.class);-

     Check all answers on Stack Overflow

     2/5

   • Java API Design: NumberFormatException for Method that Parses a Semi-Numeric String?

     Top Answer

     Answered Apr 15, 2011 · 3 votes

     I would have suggested IllegalFormatException

     as base class (which inherits from IllegalArgumentException, but unfortunately the sole Constructor is Package-protected, so I'd probably use

     • IllegalArgumentException for asmall API (a few methods)
     • your own Class Hierarchy that inherits from IllegalArgumentException otherwise.

     In any case, I would use IllegalArgumentException as base class.

     In one of my previous projects, the guideline was to only throw RuntimeExceptions that inherit from

     • IllegalStateException
     • IllegalArgumentException
     • UnsupportedOperationException

     Although this isn't an official dogma, I'd call it a good practice. All three of these are simple and self-descriptive.

     Check all answers on Stack Overflow

     3/5

   • Methods of max() and sum() undefined in the Java Spark Dataframe API (1.4.1)

     Top Answer

     Answered Jun 09, 2016 · 11 votes

     The import didn't work for me. Eclipse IDE still showed the compilation error.

     But the following method call worked

     df.groupBy("Gender").agg(org.apache.spark.sql.functions.max(df.col("Id")), org.apache.spark.sql.functions.sum(df.col("Income")));-

     In case the aggregation involves only one field, we can also use the following syntax,

     df.groupBy("Gender").max("Income");

     Check all answers on Stack Overflow

     4/5

   • Java Spring : Return large string in rest api

     Top Answer

     Answered Aug 25, 2018 · 2 votes

     I think a way to improve the situation is to send this as a Stream. It will at least prevent you from loading all this data in your RAM.

     You can also think about compress your response (gzip for example). It will highly reduce the size of the data.

     The next thing you can do depends on fonctional aspect. Is it possible to cut your string and allow to read, maybe 100 lines, on each request ?

     Maybe you can add 2 parameters to your WS : the number of lines you want and the offset. Maybe you can add some parameters to filter the lines you don't want. Maybe each line have a date you can use to do the filtering. Your goal must be to limit the amount of data you sent, and to limit the I/O or the processing when building your string. I don't know if your read your string from a database, a file or if it's the result of some calculations.

     Check all answers on Stack Overflow

     5/5

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   Java String Class API Guide (Updated Java 21) - The Documentation

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   How do I return a substring in Java?

   • String str = "javaguides" ; CharSequence subStr = str. subSequence( 0, str. length()); System. out. println( "Returns a character sequence that " + " is a subsequence of this sequence : " + subStr); Output: There are two forms of substring () methods. String substring (int beginIndex) - Returns a string that is a substring of this string.

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3. docs.oracle.com › 8 › docsString (Java Platform SE 8 ) - Oracle Help Center

   docs.oracle.com › 8 › docs

   • Cached

   . is equivalent to: char data[] = {'a', 'b', 'c'}; String str = new String(data); . Here are some more examples of how strings can be used: System.out.println("abc"); String cde = "cde"; System.out.println("abc" + cde); String c = "abc".substring(2,3); String d = cde.substring(1, 2); .

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4. www.w3schools.com › java › java_ref_stringJava String Reference - W3Schools

   www.w3schools.com › java › java_ref_string

   • Cached

   The String class has a set of built-in methods that you can use on strings. Method. Description. Return Type. charAt () Returns the character at the specified index (position) char. codePointAt () Returns the Unicode of the character at the specified index.

   Method	Description	Return Type
   charAt ()	Returns the character at the specified ...	char
   codePointAt ()	Returns the Unicode of the character at ...	int
   codePointBefore ()	Returns the Unicode of the character ...	int
   codePointCount ()	Returns the number of Unicode values ...	int

   See full list on w3schools.com

5. www.programiz.com › java-programming › libraryJava String Methods | Programiz

   www.programiz.com › java-programming › library

   • Cached

   Java has a lot of String methods that allow us to work with strings. In this reference page, you will find all the string methods available in Java. For example, if you need to find the length of a string, use the length () method. Search String Methods. Java String split () Splits the string at the specified string (regex) Java String compareTo ()

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7. www.baeldung.com › java-stringAll About String in Java | Baeldung

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   Sep 28, 2023 · String Basic Manipulations. Checking for Empty or Blank Strings in Java (popular) Split a String in Java. Adding a Newline Character to a String in Java (popular) Remove the Last Character of a String (popular) Reverse a Strgin in Java. Check if a String Is a Palindrome in Java.

8. www.javaguides.net › 2018 › 08Java String Class API Guide (Updated Java 21) - Java Guides

   www.javaguides.net › 2018 › 08

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   Java String Class API Guide (Updated Java 21) - The Documentation. Author: Ramesh Fadatare. Core Java java.lang Package String Handling. In this guide, you will learn all the String class APIs/methods with an example and we provided an update on the latest methods as of Java 21.

9. www.baeldung.com › java-string-operationsCommon String Operations in Java | Baeldung

   www.baeldung.com › java-string-operations

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   Jan 8, 2024 · Introduction. String-based values and operations are quite common in everyday development, and any Java developer must be able to handle them. In this tutorial, we’ll provide a quick cheat sheet of common String operations. Additionally, we’ll shed some light on the differences between equals and “==” and between StringUtils#isBlank and # isEmpty.