- Java.lang Package classes
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- Java.lang - RuntimePermission
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- Java.lang - Short
- Java.lang - StackTraceElement
- Java.lang - StrictMath
- Java.lang - String
- Java.lang - StringBuffer
- Java.lang - StringBuilder
- Java.lang - System
- Java.lang - Thread
- Java.lang - ThreadGroup
- Java.lang - ThreadLocal
- Java.lang - Throwable
- Java.lang - Void
- Java.lang Package extras
- Java.lang - Interfaces
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- Java.lang Package Useful Resources
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Java.lang.StringBuilder.indexOf() Method
Description
The java.lang.StringBuilder.indexOf(String str) method returns the index within this string of the first occurrence of the specified substring.
Declaration
Following is the declaration for java.lang.StringBuilder.indexOf() method
public int indexOf(String str)
Parameters
str − This is the substring value.
Return Value
This method returns the index of the first character of the first such substring, if the string argument occurs as a substring within this object.If it does not occur as a substring, -1 is returned. .
Exception
NullPointerException − if str is null.
Example
The following example shows the usage of java.lang.StringBuilder.indexOf() method.
package com.tutorialspoint; import java.lang.*; public class StringBuilderDemo { public static void main(String[] args) { StringBuilder str = new StringBuilder("programming language"); System.out.println("string = " + str); // returns the index of the specified substring System.out.println("Index of substring = " + str.indexOf("age")); // returns -1 as substring is not found System.out.println("Index of substring = " + str.indexOf("k")); } }
Let us compile and run the above program, this will produce the following result −
string = programming language Index of substring = 17 Index of substring = -1
java_lang_stringbuilder.htm
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