小魔仙

摘要： Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or another expression. For example: ["2", "1", "+", "3", "*"]... 阅读全文

摘要： You may have been using Java for a while. Do you think a simple Java array question can be a challenge? Let's use the following problem to test. Problem: Rotate an array of n elements to the right by... 阅读全文

摘要： If we want to copy an array, we can use either System.arraycopy() or Arrays.copyOf(). In this post, I use a simple example to demonstrate the difference between the two. 1. Simple Code Examples Syst... 阅读全文