The Java StringBuilder is a class that most Java programmers are familiar with. In this tutorial, we will learn about the Java StringBuilder.insert() function, and learn how to use this function to insert a value/object in StringBuilder sequence, with the help of examples. The toString() method returns the string representation of the object. is explained. If you print any object, java compiler internally invokes the toString() method on the object. Java StringBuilder class is used to create mutable (modifiable) string. So overriding the toString() method, returns the desired output, it can be the state of an object etc. Java StringBuilder class. it is used to create mutable string object. ToStringBuilder is a utility class provided by apache commons lang library. StringBuilderクラスを使うと、以下のような処理が簡単に行えます。 ・文字列の結合 ・文字列の挿入 ・文字列の部分置換 ・文字列の部分削除 ・文字列の部分取り出し ・文字列の検索. The method signature is as follows: String toString() When StringBuilder is constructed, it may start at the default capacity (which happens to be 16) or one of the programmer's choosing. insert(int offset, boolean b) Submitted by Preeti Jain, on December 22, 2019 StringBuilder Class toString() method. StringBuilder in Java is a mutable sequence of characters. ToStringBuilder is a utility class provided by apache commons lang library. depends on your implementation. Also, String, StringBuffer and StringBuilder - Which one to use ? String toString() Returns a string that contains the character sequence in the builder. A immutable object is the object whose content cannot be changed after it is created. StringBuilder Class toString() method: Here, we are going to learn about the toString() method of StringBuilder Class with its syntax and example. toString() method is available in java.lang package.. toString()方法在java.lang包中可用。. It provides a consistent and better control over what and how much data, an object should expose using toString() method and in which format. StringBuilder replace(int start, int end, String s) void setCharAt(int index, char c) Replaces the specified character(s) in this string builder. A String is immutable in Java, while a StringBuilder is mutable in Java. StringBuilder objects are like String objects, except that they can be modified i.e. toString() method is used to represent string denoted by this object (when we create a new string object so first it is created and instantiated to contain the data[set of characters] denoted by this object currently). toString() method is available in java.lang package. The Java StringBuilder class is same as StringBuffer class except that it is non-synchronized. StringBuilder类的toString()方法 (StringBuilder Class toString() method). When we try to concatenate two strings in Java, a new string object is created in the string pool. Java StringBuilder.insert() – Examples. This article explores Constructors, methods of Java StringBuilder class. StringBuilder reverse() Reverses the sequence of characters in this string builder. If you want to represent any object as a string, toString() method comes into existence. For StringBuilder, Java knows the size is likely to change as the object is used. It is of utmost importance, especially when you want to avoid creating unnecessary string objects when looping through tens or hundreds of thousands of records. Unlike String, the content of the StringBuilder can be changed after it is created using its methods. Important Constructors of StringBuilder class This will produce a toString of the format: Person@7f54[name=Stephen,age=29,smoker=false] To add the superclass toString , use appendSuper(java.lang.String) . Java StringBuilder tutorial with examples will help you understand how to use Java StringBuilder in an easy way. Java Override toString() with ToStringBuilder. ... toString() The last method converts a StringBuilder into a String. It is available since JDK 1.5. To append the toString from an object that is delegated to (or any other object), use appendToString(java.lang.String) .