Given a string, determine if it is an integer. For example the string “123” is an integer, but the string “hello” is not. It is an integer if all of the characters in the string are digits. Return true if it is an integer, or false if it is not. Hint: There is a method Character.isDigit() that takes a char as an argument and returns a boolean value. what is wrong in this code? public boolean isInteger(String) { for (int i = 0; i < String.length(); i++) { if (!Character.isDigit(String.charAt(i))) { return false; } } return true;

Q: Java

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.