The Java String compareTo method is used for comparing two strings lexicographically. Each character of both the strings is converted into a Unicode value for comparison. If both the strings are equal then this method returns 0 else it returns positive or negative value.
Since we store java objects in Collection there are also certain Set and Map which provides automating sorting when you insert element on that e. TreeSet and TreeMap. The method compareTo is used for comparing two strings lexicographically in Java.
Using String. If all the contents of both the strings are same then it returns true. If all characters do not match , then it returns false. If the two objects have the same values, equals will return true. In the second comparison , equals checks to see whether the passed object is null, or if it's typed as a different class. If it's a different class then the objects are not equal.
Finally, equals compares the objects ' fields. CompareTo method in C is used to compare this instance to a specified object or another Int16 instance and returns an integer that indicates whether the value of this instance is less than, equal to, or greater than the value of the specified object or the other Int16 instance.
You should use the equals method of the String class to compare Strings. Strings in Java are immutable. If they are both equal it will return true and false otherwise. Whereas equals in string compares the string contents. By default, Collection. ClassCastException: If this object cannot get compared with the specified object.
When we compare two strings in which either first or second string is empty, the method returns the length of the string. So, there may be two scenarios:. To check whether the compareTo method considers the case sensitiveness of characters or not, we will make the comparison between two strings that contain the same letters in the same sequence.
Suppose, a string having letters in uppercase, and the second string having the letters in lowercase. On comparing these two string, if the outcome is 0, then the compareTo method does not consider the case sensitiveness of characters; otherwise, the method considers the case sensitiveness of characters.
Conclusion: It is obvious by looking at the output that the outcome is not equal to zero. Hence, the compareTo method takes care of the case sensitiveness of characters. The ClassCastException is thrown when objects of incompatible types get compared. In the following example, we are comparing an object of the ArrayList al with a string literal "Sehwag". The NullPointerException is thrown when a null object invokes the compareTo method. Observe the following example.
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Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. What do the return values of Comparable. Ask Question. Asked 11 years, 1 month ago. Active 6 months ago. Viewed k times. Magggi Magggi 1, 1 1 gold badge 11 11 silver badges 17 17 bronze badges. Do try the Javadoc some time. Add a comment. Active Oldest Votes. Official Definition From the reference docs of Comparable.
My Version In short: this. Some additional points Note: It is good practice for a class that implements Comparable to declare the semantics of it's compareTo method in the javadocs.
Sean Patrick Floyd Sean Patrick Floyd k 60 60 gold badges silver badges bronze badges. Remember, in the documentation they talk about sgn , not directly -1 and 1. The compareTo method compares two strings lexicographically. From the reference docs of Comparable. Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object. The method accepts a parameter of type String that is to be compared with the current string. It throws the following two exceptions:,If second string is an empty string, the method returns a positive number that is the length of the first string.
In the following example, we are comparing an object of the ArrayList al with a string literal "Sehwag". The result is zero if the strings are equal, compareTo returns 0 exactly when the equals Object method would return true. The internal working of the compare method can be visualized with the help of below pseudocode:,Prerequisite: Comparator Interface in Java, TreeSet in JavaThe compare method in Java compares two class specific objects x, y given as parameters.
It returns the value: ,How compare method works in Java,where obj1 and obj2 are the two objects to be compared using compare method. If both the strings has space in them? Also if the no of characters in both the strings are not equal then what will be the output?
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