Core Java - Interview Questions and Answers for 'Variable' | Search Interview Question

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Q41. What is the default data type of state variables in Clonable interface and Serializable interface ?

Ans. Cloneable and Serializable are Marker Interfaces, So these are empty interfaces with no variables.

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Q42. Difference between System.getEnv and System.getProperties ?

Ans. System.getEnv gets the environment variables where System.getProperties gets Java properties.

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Q43. Can we load environment variables into Properties in Java ? How ?

Ans. Yes

new Properties().putAll(System.getenv());

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Q44. Can the value of a static variable be changed ?

Ans. Yes the value of a static variable can be changed. It's the final keyword that restrict the modification of value not static.

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