- Java.util Package Classes
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- Java.util Package Extras
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- Java.util - Discussion
Java Collections max() Method
Description
The Java Collections max(Collection<? extends T>) method is used to return the maximum element of the given collection, according to the natural ordering of its elements.
Declaration
Following is the declaration for java.util.Collections.max() method.
public static <T extends Object & Comparable<? super T>> T max(Collection<? extends T> coll)
Parameters
coll − The collection whose maximum element is to be determined.
Return Value
The method call returns the maximum element of the given collection, according to the natural ordering of its elements.
Exception
ClassCastException − This is thrown if the collection contains elements that are not mutually comparable (for example, strings and integers).
NoSuchElementException − This is thrown if the collection is empty.
Java Collections max(ollection<? extends T>, Comparator<? super T>) Method
Description
The max(Collection<? extends T>, Comparator<? super T>) method is used to return the maximum element of the given collection, according to the order induced by the specified comparator.
Declaration
Following is the declaration for java.util.Collections.max() method.
public static <T> T max(Collection<? extends T> coll,Comparator<? super T> comp)
Parameters
coll − The collection whose maximum element is to be determined.
coll − The comparator with which to determine the maximum element.
Return Value
The method call returns the maximum element of the given collection, according to the specified comparator.
Exception
ClassCastException − This is thrown if the collection contains elements that are not mutually comparable using the specified comparator.
NoSuchElementException − This is thrown if the collection is empty.
Getting Max Value From a List of Integers Example
The following example shows the usage of Java Collection max(Collection) method to get maximum from a list of Integers. We've created a list with some integers. Using max(Collection) method, we're retrieved the maximum value and printed.
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(1,2,3,4,5,6)); System.out.println("List: " + list); System.out.println("Max value: "+ Collections.max(list)); } }
Output
Let us compile and run the above program, this will produce the following result.
List: [1, 2, 3, 4, 5, 6] Max value: 6
Getting Max Value From a List of Strings Example
The following example shows the usage of Java Collection max(Collection) method to get maximum from a list of Strings. We've created a list with some Strings. Using max(Collection) method, we're retrieved the maximum value and printed.
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","E","F")); System.out.println("List: " + list); System.out.println("Max value: "+ Collections.max(list)); } }
Output
Let us compile and run the above program, this will produce the following result.
List: [A, B, C, D, E, F] Max value: F
Getting Max Value From a List of Comparable Objects Example
The following example shows the usage of Java Collection max(Collection) method to get maximum from a list of Student objects. We've created a list with some Student object. Using max(Collection) method, we're retrieved the maximum value and printed. Here Student class implemented the comparable interface.
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"))); System.out.println("List: " + list); System.out.println("Max value: "+ Collections.max(list)); } } class Student implements Comparable<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); } @Override public int compareTo(Student student) { return this.rollNo - student.rollNo; } }
Output
Let us compile and run the above program, this will produce the following result.
List: [[ 1, Julie ], [ 2, Robert ], [ 3, Adam ]] Max value: [ 3, Adam ]
Getting Max Value From a List of Objects Using Comparator Example
The following example shows the usage of Java Collection max(Collection, Comparator) method to get maximum from a list of Student objects. We've created a list with some Student object. Using max(Collection, Comparator) method, we're retrieved the maximum value and printed.
package com.tutorialspoint; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.Comparator; 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"))); RollNoComparator comparator = new RollNoComparator(); System.out.println("List: " + list); System.out.println("Max value: "+ Collections.max(list,comparator)); } } 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); } public int getRollNo() { return rollNo; } public void setRollNo(int rollNo) { this.rollNo = rollNo; } public String getName() { return name; } public void setName(String name) { this.name = name; } } class RollNoComparator implements Comparator<Student>{ @Override public int compare(Student o1, Student o2) { return o1.getRollNo()-o2.getRollNo(); } }
Output
Let us compile and run the above program, this will produce the following result.
List: [[ 1, Julie ], [ 2, Robert ], [ 3, Adam ]] Max value: [ 3, Adam ]
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