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Integer is stored in 32 bits of memory. To find max and min values of Integer in Java we can use inbuilt fields of Integer class : Integer.MAX_VALUE = 2147483647 Integer.MIN_VALUE = -2147483648 Let us look at the example code : Output
Long is stored in 64 bits of memory. To find max and min values of Long in Java we can use inbuilt fields of Long class : Long.MAX_VALUE = 9223372036854775807 Long.MIN_VALUE = -9223372036854775808 Let us look at the example code : Output
We are not allowed to enter duplicate keys in HashMap, but we can enter duplicate values in it. Please note here that, if we enter duplicate keys no error will be thrown but the latest key-value pair entered will replace the old key-value pair. Let us see with an example: In the above code we … Read more
HashMap is one of the most used collections in Java. It is used to store key value pair. The size of HashMap increases as more key value pairs are added. Let us look at sample declaration of HashMap: HashMap<Integer,String> dummy = new HashMap<Integer,String>(); In above sample the key stored will be of type Integer and … Read more
PI value in mathematics is a very important value used in number of formulas. In java value of PI can be obtained through Math class of java.lang package. Math.PI is a double constant whose value = 3.141592653589793 Let us look at a program to calculate area of circle using Math.PI Output