Solution. The above code sample will produce the following result. Multiple class paths are separated by a semicolon. Happy Learning !! Examples: Input: val = 1 Output: 1.0000 Upto 4 decimal places Input : 12.5 Output : 12.500000 Upto 6 decimal places Example But the beauty of Java lies in the fact that we can do desired things with some smart workarounds. But Java isn’t completely unreasonable about the use of types. For example: For Key A, you want to store - Apple, Aeroplane Return value. Java HashMap. Though you add more null values if you try to print its contents, it displays only one null. 1. As per the definition a set object does not allow duplicate values but it does allow at most one null value. First of all, we're going to introduce a simple way to add multiple items into an ArrayList. As, add() method returns Boolean and on adding duplicates it will return false. This post provides an overview of some of the available alternatives to accomplish this. Class path set. But sometimes you may want to store multiple values for the same key. The source for this interactive example is stored in a GitHub repository. Read More: A Guide to Java ArrayList ArrayList Java Docs A collection that contains no duplicate elements. In the ArrayList chapter, you learned that Arrays store items as an ordered collection, and you have to access them with an index number (int type). Set interface in Java can be used to store unique values within you program. So returning multiple values from a method is theoretically not possible in Java. Store unique values in Java using Set interface In this section we will discuss about the Set interface in Java which is designed to store unique values. c:> java -classpath C:\java\MyClasse1;C:\java\MyClass2 utility.testapp.main Result. “at” … Following example demonstrates how to set multiple classpath. Using the add() method. Examples. The value of the element to add to the Set object. Null values in a Set object. For example, you can’t assign a double value (like 3.14) to an int variable. In this article we will discuss how to create a HashMap with multiple values associated with same Key in Java. If we insert duplicate values to the Set, we don’t get any compile time or run time errors. “the” occurred at following indexes 1,4,8,12. More formally, sets contain no pair of elements e1 and e2 such that e1.equals(e2), and at most one null element.As implied by its name, this interface models the mathematical set abstraction.. How to set multiple classpath? Below java source code example works fine and JVM (Java Virtual Machine) doesn’t complain. Using a POJO class instance. Null values in HashSet − The HashSet object allows null values but, you can add only one null element to it. It doesn’t add duplicate values in the set. HashMap can be used to store key-value pairs. Java allows you to assign an int value (like myRandom.nextInt(5)) to a double variable (like interestRate). Java has very strict rules about the use of types. First, we'll be using addAll() , which takes a collection as its argument: List anotherList = Arrays.asList(5, 12, 9, 3, 15, 88); list.addAll(anotherList); Given a double value val, the task is to set its precision value to a specific decimal places.. The Set object with added value. In above examples, we learned to all multiple elements to arraylist. For example. A HashMap however, store items in "key/value" pairs, and you can access them by an index of another type (e.g. a String).. One object is used as a key (index) to another object (value). Scenario. Suppose we want to create a HashMap to keep the track of strings and their occurrences in text. We have added all element to arraylist and then we saw the example to add only selected items to the arraylist from Java 8 stream of elements. 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