. Use (Yahoo web space) Supertype. After creating the interface IHelloWorld
. Use Supertype. After creating the interface IHelloWorld you can call the function Refactor > Use Supertype Where Possible for class HelloWorld. This function offers you a choice between the types IHelloWorld and Object. Both are supertypes of HelloWorld. If you now select IHelloWorld, Eclipse will replace all references to HelloWorld with references to IHelloWorld, provided that this will not result in compilation errors. . Convert Nested Type to Top Level. Inner classes and interfaces can be separated into their own compilation unit (.java file) by applying the method Refactor > Convert Nested Type to Top Level to them. The new compilation unit is equipped with the necessary import statements. In the type definition that previously contained the inner type, a new class field is generated whose type declaration refers to the newly generated top-level type. In addition, the constructor of the container type is extended with a new parameter that supplies the new field with an instance of the new top-level type. . Convert Anonymous Type to Nested Type. Anonymous classes are used quite often as event listeners. Such anonymous classes can be converted easily into named inner classes by applying the function Refactor > Convert Anonymous to Nested . Variables . Extract Local Variable. The function Refactor > Extract Local Variable replaces the selected expression with the name of a new variable. A suitable variable assignment is inserted before the modified expression. For example, in System.out.println(”Hello World”); select HelloWorld and apply the function. In the dialog that appears, specify hi for the variable name. The result is: String hi = “Hello World”; System.out.println(hi); Optionally, all occurrences of HelloWorld are replaced with a reference to the variable hi. . Inline method or local variable. The function Refactor > Inline works in the opposite way. For example, if you select the variable hi and apply this function, all occurrences of hi are replaced with the value of hi (the string Hello World). Before the replacement is performed, a dialog box shows you the effects of the replacement by comparing the old version with the new version of the compilation unit (see the Local History section). Similarly, you can resolve a method by selecting the method name and invoking this function. . Encapsulate. The function Refactor > Self Encapsulate allows you to convert a public variable into a private variable. It generates the access method for this variable (see also Generate Getter and Setter in the Encapsulating Fields section) and updates all read and write access to this variable accordingly. Before: public int status; public void process() { switch (status) { case 0 : 41 Effective Programming with Eclipse
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