In Java, it is important to validate method parameters wherever necessary, for example, by using Objects.requireNonNull(), throwing an IllegalArgumentException, or using a try catch block. Additionally, null checks should also be done whenever appropriate, to make sure that parameters are not null before the method is called. It is also recommended to use the throws keyword in the method signature if using try catch or throw new WhateverException. It is also best practice to null check and validate parameters in both public and private methods. Finally, where possible it is recommended to use the Optional class to require parameters, which will provide additional safety.
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