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Some methods of StringBuilder class

In the table below, we have given a short preview about some important methods of StringBuilder class.

Methods	Description
public StringBuilder append(String str)	This method appends the String at the end of StringBuilder object. StringBuilder sb= new StringBuilder("Hello"); sb.append("There"); Modifies the StringBuilder object to HelloThere
public StringBuilder append(int i)	This method appends an int at the end of StringBuilder object. StringBuilder sb= new StringBuilder("High"); sb.append(5); Modifies the StringBuilder object to High5
public StringBuilder append(double d)	This method appends a double at the end of StringBuilder object. StringBuilder sb= new StringBuilder("Version"); sb.append(5.0); Modifies the StringBuilder object to Version5.0
public StringBuilder append(float f)	This method appends a float at the end of StringBuilder object.. StringBuilder sb= new StringBuilder("Version"); sb.append(5.2f); Modifies the StringBuilder object to Version5.2
public StringBuilder append(long l)	This method appends a long at the end of StringBuilder object.. StringBuilder sb= new StringBuilder("Hello"); sb.append("1000L"); Modifies the StringBuilder object to Hello1000
public StringBuilder reverse()	This method reverses the string of characters in StringBuilder object. StringBuilder sb= new StringBuilder("Blue"); sb.reverse(); Modifies the StringBuilder object to eulB

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Methods	Description
public StringBuilder delete(int startIndex, int endIndex)	This method deletes the substring starting at index(startIndex)and ending at index(endIndex) in StringBuilder object. StringBuilder sb= new StringBuilder("Blue"); sb.delete(0,2); Modifies the StringBuilder object to ue
public StringBuilder deleteCharAt(int index)	This method deletes a character at specified index in StringBuilder object. StringBuilder sb= new StringBuilder("Blue"); sb.deleteCharAt(2); Modifies the StringBuilder object to Ble
public StringBuilder indexOf(String str)	This method returns us the index of the first occurrence of a specified substring(str) in the StringBuilder object. StringBuilder sb= new StringBuilder("Blue"); int index = sb.indexOf("ue"); Returns the index of ue- 2
public StringBuilder lastIndexOf(String str)	This method returns us the index of the last occurrence of a specified substring(str) in the StringBuilder object. StringBuilder sb= new StringBuilder("Blueue"); int lastIndex = sb.lastIndexOf("ue"); Returns the last index of ue- 4
public StringBuilder insert(int index, String str)	This method inserts a String(str) at a specfied index in the StringBuilder object. StringBuilder sb= new StringBuilder("Blue"); sb.insert(0,"Color"); Modifies the StringBuilder object to ColorBlue
public StringBuilder insert(int index, int i)	This method inserts an int variable at a specfied index in the StringBuilder object. StringBuilder sb= new StringBuilder("Blue"); sb.insert(1,"5"); Modifies the StringBuilder object to B5lue
public StringBuilder insert(int index, double d)	This method inserts a double variable at a specfied index in the StringBuilder object. StringBuilder sb= new StringBuilder("Blue"); sb.insert(1,5.0); Modifies the StringBuilder object to B5.0lue
public StringBuilder insert(int index, float f)	This method inserts a float variable at a specfied index in the StringBuilder object. StringBuilder sb= new StringBuilder("Blue"); sb.insert(1,5.5f); Modifies the StringBuilder object to B5.5lue
public StringBuilder insert(int index, long l)	This method inserts a long variable at a specfied index in the StringBuilder object. StringBuilder sb= new StringBuilder("Blue"); sb.insert(1,555L); Modifies the StringBuilder object to B555lue
public void setCharAt(int index, char ch)	This method sets a character at an index to specified char(ch). StringBuilder sb= new StringBuilder("Blue"); sb.setCharAt(1,'Z'); Modifies the StringBuilder object to BZue
public void length()	This method gives us total number of character in StringBuilder Object. StringBuilder sb= new StringBuilder("Blue"); sb.length(); Returns the length of StringBuilder object of - 4

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