How much do you know about coding problems when writing java programs? What are the problems that should be noticed and ignored?

  java, question

The coding problem led to a program error. I admit that I neglected coding in this process. What statement should java program use to define coding? What coding problems should we pay attention to? The students who have just come into contact with java must have ignored these problems. To sum up, how did you treat the coding problem and how did you deal with it when writing java?