Can optional be null?

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What is web container in java?

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What is a bean class?

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What is the difference between a jvm and a jdk?

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suppose we have one String s="india is my country"; now we get the o/p "like country my is India". what is the logic?

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What is java aop?

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how can we create the ui using netbeans,having the code?

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Do I really have to type in the programs in the book to try them out?

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What is cmp in java?

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What do you understand by downcasting?

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What is java flatmap?

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i have make jar file but when i click in this file then arr swhow "no faund main class" plese help me in this problem becose i want to make a jar file as a dxdcutable file

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