- Java.util Package Classes
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- Java.util - LinkedHashMap
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- Java.util - ListResourceBundle
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- Java.util - Properties
- Java.util - PropertyPermission
- Java.util - PropertyResourceBundle
- Java.util - Random
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- Java.util - Stack
- Java.util - StringTokenizer
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- Java.util - TimerTask
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- Java.util - TreeSet
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- Java.util Package Extras
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- Java.util Useful Resources
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- Java.util - Discussion
Java Collections indexOfSubList() Method
Description
The Java Collections indexOfSubList(List<?>, List<?>) method is used to get the starting position of the first occurrence of the specified target list within the specified source list.
Declaration
Following is the declaration for java.util.Collections.indexOfSubList() method.
public static int indexOfSubList(List<?> source, List<?> target)
Parameters
source − This is the list in which to search for the first occurrence of target.
target − This is the list to search for as a subList of source.
Return Value
The method call returns the starting position of the first occurrence of the specified target list within the specified source list, or -1 if there is no such occurrence.
Exception
NA
Getting Index of SubList of a List of Integers Example
The following example shows the usage of Java Collection indexOfSubList(List,List) method. We've created a List object with some integers, printed the original list. Using indexOfSubList(List, List) method, we've printed the first index of sublist of list.
package com.tutorialspoint; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; public class CollectionsDemo { public static void main(String[] args) { List<Integer> list = new ArrayList<>(Arrays.asList(1,2,3,3,5,3)); System.out.println("Initial collection value: " + list); // print the first index of sublist. int result = Collections.indexOfSubList(list, Arrays.asList(3,5,3)); System.out.println("3,5,3 are present at: " + result); } }
Output
Let us compile and run the above program, this will produce the following result −
Initial collection value: [1, 2, 3, 3, 5, 3] 3,5,3 are present at: 3
Getting Index of SubList of a List of Strings Example
The following example shows the usage of Java Collection indexOfSubList(List,List) method. We've created a List object with some strings, printed the original list. Using indexOfSubList(List, List) method, we've printed the first index of sublist of list.
package com.tutorialspoint; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; public class CollectionsDemo { public static void main(String[] args) { List<String> list = new ArrayList<>(Arrays.asList("A","B","C","D","C","C")); System.out.println("Initial collection value: " + list); // print the first index of sublist. int result = Collections.indexOfSubList(list, Arrays.asList("C","D","C")); System.out.println("C, D, C are present at: " + result); } }
Output
Let us compile and run the above program, this will produce the following result −
Initial collection value: [A, B, C, D, C, C] C, D, C are present at: 2
Getting Index of SubList of a List of Objects Example
The following example shows the usage of Java Collection indexOfSubList(List,List) method. We've created a List object with some Student objects, printed the original list. Using indexOfSubList(List, List) method, we've printed the first index of sublist of list.
package com.tutorialspoint; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; public class CollectionsDemo { public static void main(String[] args) { List<Student> list = new ArrayList<>(Arrays.asList(new Student(1, "Julie"), new Student(2, "Robert"), new Student(3, "Adam"),new Student(1, "Julie"))); System.out.println("Initial collection value: " + list); // print the first index of sublist int result = Collections.indexOfSubList(list, Arrays.asList(new Student(3, "Adam"),new Student(1, "Julie"))); System.out.println("Adam, Julie are present at: " + result); } } class Student { int rollNo; String name; Student(int rollNo, String name){ this.rollNo = rollNo; this.name = name; } @Override public String toString() { return "[ " + this.rollNo + ", " + this.name + " ]"; } @Override public boolean equals(Object obj) { Student s = (Student)obj; return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name); } }
Output
Let us compile and run the above program, this will produce the following result −
Initial collection value: [[ 1, Julie ], [ 2, Robert ], [ 3, Adam ], [ 1, Julie ]] Adam, Julie are present at: 2
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