3 回答@SuppressWarnings("resource") 什么意思啊

3 回答The operator - is undefined for the argument type(s) String, int 是什么錯誤？

1 回答Multiple markers at this line - The serializable class HelloWorld does not declare a static final serialVersionUID field of type long - The public type HelloWorld must be defined in its own file - The type HelloWorld is already defined

1 回答error：library is notspecified

3 回答Multiple markers at this line - Syntax error on token ")", ; expected - void is an invalid type for the variable main - Syntax error on token "(", ; expected