The java.lang.Double.compareTo() is a built-in method in java that compares two Double objects numerically. This method returns 0 if this object is equal to the argument object, it returns less than 0 if this object is numerically less than the argument object and a value greater than 0 if this object is numerically greater than the argument object.
public int compareTo(Object obj)
Parameter: The method accepts one parameter.
obj – The object which is to be compared to.
Return Values: The function can return three values:
- equal to 0: Object is equal to the argument object
- less than 0: Object is less than the argument object
- greater than 0: Object is greater than the argument object
Below programs illustrates the working of java.lang.Double.compareTo() method:
Program 1: When both objects are different.
object1 is less than object2
Program 2: When no argument is passed.
prog.java:14: error: method compareTo in class Double cannot be applied to given types; int compareValue = obj1.compareTo(); ^ required: Double found: no arguments reason: actual and formal argument lists differ in length 1 error
Program 3: When anything other than object is passed as an argument.
prog.java:15: error: incompatible types: String cannot be converted to Double int compareValue = obj1.compareTo("gfg"); ^ Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output 1 error
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