min()<\/code> and max()<\/code> methods introduced in java8 programming.<\/p>\n\n- Stream.min()<\/strong> – Returns the minimum element of the stream according to the provided comparator.\n
\n- Represented by the code syntax –
Optional<T> min(Comparator<? super T> comparator)<\/code><\/li>\n- It is a terminal operation that combines the stream elements and returns the final result<\/li>\n
- Returns an optional or an empty optional if the stream is empty<\/li>\n
- Throw the
NullPointerException<\/code> if the smallest element is null<\/code><\/li>\n<\/ul>\n<\/li>\n- Stream.max()<\/strong> – Returns the maximum element of the stream according to the provided comparator.\n
\n- Represented by the code syntax –
Optional<T> max(Comparator<? super T> comparator)<\/code><\/li>\n- It is a terminal operation that combines the stream elements and returns the final result<\/li>\n
- Returns an optional or an empty optional if the stream is empty<\/li>\n
- Throw the
NullPointerException<\/code> if the largest element is null<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n![\"java](\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/java-logo.jpg\")
<\/a><\/figure>\n<\/div>\n2. Practice<\/h2>\n
Let us dive into some practice stuff from here and I am assuming that you already have the Java 1.8 or greater installed in your local machine. I am using JetBrains IntelliJ IDEA<\/a> as my preferred IDE. You’re free to choose the IDE of your choice.<\/p>\n2.1 Find min and max integer<\/h3>\n
Create a java file in the com.java8<\/code> package and add the following code to it.<\/p>\nMinMaxDemo1.java<\/em><\/span><\/p>\npackage com.java8;\n\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.List;\nimport java.util.Optional;\n\n\/*\n * Stream.min() - Returns the minimum element of this stream according to the provided comparator.\n * Stream.max() - Returns the maximum element of this stream according to the provided comparator.\n *\/\npublic class MinMaxDemo1 {\n\t\n\tprivate static void findMinAndMaxForIntegers() {\n\t\tSystem.out.println(\"---- Min and Max for integer ----\");\n\t\t\n\t\tfinal List<Integer> integers = Arrays.asList(6, 5, 20, 2, 1);\n\t\t\/\/ integer comparator\n\t\tfinal Comparator<Integer> comparator = Comparator.comparing(Integer::intValue);\n\t\t\n\t\tfinal Optional<Integer> min = integers.stream().min(comparator);\n\t\t\/\/ handling the sonar issue to perform ifPresent check before fetch\n\t\tmin.ifPresent(val -> System.out.println(\"Stream.min():- \" + val));\n\t\t\n\t\tfinal Optional<Integer> max = integers.stream().max(comparator);\n\t\t\/\/ handling the sonar issue to perform ifPresent check before fetch\n\t\tmax.ifPresent(val -> System.out.println(\"Stream.max():- \" + val));\n\t}\n\t\n\tpublic static void main(String[] args) {\n\t\tfindMinAndMaxForIntegers();\n\t}\n}\n<\/pre>\nRun the file and if everything goes well the following output will be logged in the IDE console.
<\/div> <\/div><\/p>\nConsole output<\/em><\/span><\/p>\n---- Min and Max for integer ----\nStream.min():- 1\nStream.max():- 20\n<\/pre>\n2.2 Find min and max string<\/h3>\n
Create a java file in the com.java8<\/code> package and add the following code to it.<\/p>\nMinMaxDemo2.java<\/em><\/span><\/p>\npackage com.java8;\n\nimport java.util.Arrays;\nimport java.util.Comparator;\nimport java.util.List;\nimport java.util.Optional;\n\n\/*\n * Stream.min() - Returns the minimum element of this stream according to the provided comparator.\n * Stream.max() - Returns the maximum element of this stream according to the provided comparator.\n *\/\npublic class MinMaxDemo2 {\n\n\tprivate static void findMinAndMaxForStrings() {\n\t\tSystem.out.println(\"---- Min and Max for string ----\");\n\t\t\n\t\tfinal List<String> strings = Arrays.asList(\"A\", \"F\", \"Z\", \"B\", \"P\");\n\t\t\/\/ string comparator\n\t\tfinal Comparator<String> comparator = Comparator.comparing(String::valueOf);\n\t\t\n\t\tfinal Optional<String> min = strings.stream().min(comparator);\n\t\t\/\/ handling the sonar issue to perform ifPresent check before fetch\n\t\tmin.ifPresent(val -> System.out.println(\"Stream.min():- \" + val));\n\t\t\n\t\tfinal Optional<String> max = strings.stream().max(comparator);\n\t\t\/\/ handling the sonar issue to perform ifPresent check before fetch\n\t\tmax.ifPresent(val -> System.out.println(\"Stream.max():- \" + val));\n\t}\n\t\n\tpublic static void main(String[] args) {\n\t\tfindMinAndMaxForStrings();\n\t}\n}\n<\/pre>\nRun the file and if everything goes well the following output will be logged in the IDE console.<\/p>\n
Console output<\/em><\/span><\/p>\n---- Min and Max for string ----\nStream.min():- A\nStream.max():- Z\n<\/pre>\n2.3 Find min and max object<\/h3>\n
Create a java file in the com.java8<\/code> package and add the following code to it.<\/p>\nMinMaxDemo3.java<\/em><\/span><\/p>\npackage com.java8;\n\nimport java.util.ArrayList;\nimport java.util.Comparator;\nimport java.util.List;\nimport java.util.Optional;\n\n\/*\n * Stream.min() - Returns the minimum element of this stream according to the provided comparator.\n * Stream.max() - Returns the maximum element of this stream according to the provided comparator.\n *\/\npublic class MinMaxDemo3 {\n\n\tprivate static void findMinAndMaxByName(final List<Student> students) {\n\t\tSystem.out.println(\"\\nMin and max student by name\");\n\t\t\/\/ student name comparator\n\t\tfinal Comparator<Student> name = Comparator.comparing(Student::getName);\n\n\t\tfinal Optional<Student> min = students.stream().min(name);\n\t\t\/\/ handling the sonar issue to perform ifPresent check before fetch\n\t\tmin.ifPresent(val -> System.out.println(\"Stream.min():- \" + val.toString()));\n\n\t\tfinal Optional<Student> max = students.stream().max(name);\n\t\t\/\/ handling the sonar issue to perform ifPresent check before fetch\n\t\tmax.ifPresent(val -> System.out.println(\"Stream.max():- \" + val.toString()));\n\t}\n\n\tprivate static void findMinAndMaxByAge(final List<Student> students) {\n\t\tSystem.out.println(\"\\nMin and max student by age\");\n\t\t\/\/ student age comparator\n\t\tfinal Comparator<Student> age = Comparator.comparing(Student::getAge);\n\n\t\tfinal Optional<Student> minAge = students.stream().min(age);\n\t\t\/\/ handling the sonar issue to perform ifPresent check before fetch\n\t\tminAge.ifPresent(val -> System.out.println(\"Stream.min():- \" + val.toString()));\n\n\t\tfinal Optional<Student> maxAge = students.stream().max(age);\n\t\t\/\/ handling the sonar issue to perform ifPresent check before fetch\n\t\tmaxAge.ifPresent(val -> System.out.println(\"Stream.min():- \" + val.toString()));\n\t}\n\n\tpublic static void main(String[] args) {\n\t\tSystem.out.println(\"---- Min and Max for object ----\");\n\t\t\n\t\t\/\/ student list\n\t\tfinal List<Student> students = new ArrayList<>();\n\t\tstudents.add(new Student(\"John\", 41));\n\t\tstudents.add(new Student(\"Jane\", 20));\n\t\tstudents.add(new Student(\"Adam\", 17));\n\t\tstudents.add(new Student(\"Eve\", 3));\n\t\tstudents.add(new Student(\"Mathew\", 10));\n\t\t\n\t\tfindMinAndMaxByName(students);\n\t\tfindMinAndMaxByAge(students);\n\t}\n}\n\nclass Student {\n\tprivate final String name;\n\tprivate final int age;\n\n\tpublic Student(final String name, final int age) {\n\t\tthis.name = name;\n\t\tthis.age = age;\n\t}\n\n\tpublic String getName() {\n\t\treturn name;\n\t}\n\n\tpublic int getAge() {\n\t\treturn age;\n\t}\n\n\t@Override\n\tpublic String toString() {\n\t\treturn \"Student [name=\" + name + \", age=\" + age + \"]\";\n\t}\n}\n<\/pre>\nRun the file and if everything goes well the following output will be logged in the IDE console.[ulp id=’mp4qw6feirku6wM7′ name=’Java 8 Features Inline’]<\/p>\n
Console output<\/em><\/span><\/p>\n---- Min and Max for object ----\n\nMin and max student by name\nStream.min():- Student [name=Adam, age=17]\nStream.max():- Student [name=Mathew, age=10]\n\nMin and max student by age\nStream.min():- Student [name=Eve, age=3]\nStream.min():- Student [name=John, age=41]\n<\/pre>\nThat is all for this tutorial and I hope the article served you with whatever you were looking for. Happy Learning and do not forget to share!<\/p>\n
3. Summary<\/h2>\n
In this tutorial, we learned the min()<\/code> and max()<\/code> methods introduced in java8 programming along with the implementation. The min()<\/code> method helps to determine the smallest element from the given stream on the basis of a comparator. Similarly, the max<\/code> method helps to determine the largest element from the given stream on the basis of a comparator. You can download the source code from the Downloads<\/a> section.<\/p>\n<\/a>4. Download the Eclipse Project<\/h2>\nThis was a tutorial about the min()<\/code> and max()<\/code> methods in java 8.<\/p>\n