1: Open Help document 2: Click on the display, locate the index, and see the Input box 3: Know who you're looking for? Take scanner Example 4: Enter scanner in the input box, and then enter 5: Look at the bagThe classes under the Java.lang package do not need to be imported, and all others need to be imported.To import:JAVA.UTIL.SCANNER6: Just take a look at the class explanation and description, and don't forget to look at the class's version 7: See the structure of the classMember variablesField SummaryConstruction methodConstruction Method SummaryMember MethodsMethod Summary 8: Learn to construct a methodA: There is a construction methodCreate objects onB: No construction methodMembers may all be static 9: See Member methodsA: LeftStatic: If static, can be called through the class nameReturn value type: What is returned, you receive with what.B: RightLook at the method name: method names don't write wrongParameter list: What you want, what you give, how many people want, you give a few
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How to use the Help document
