intellij idea中快速抽取方法

Intellij Idea使用教程汇总篇

问题：有时候一个方法里面嵌套了很多逻辑，想拆分为多个方法方便调用；或者一个方法复用性很高，这时，这个方法嵌套在局部方法里面肯定是不方便的，如何快速抽取出这个方法？

public class Demo {
    private static void getInfo(Object obj) {
        Class<?> clazz = obj.getClass();
        Method[] methods = clazz.getMethods();
        for (Method method : methods) {
            String name = method.getName();
            Class<?> returnType = method.getReturnType();
            Class<?>[] parameterTypes = method.getParameterTypes();
        }

        //-----------------------------我即将抽取的-------------------------//
        Field[] declaredFields = clazz.getDeclaredFields();
        for (Field field : declaredFields) {
            String name = field.getName();
            Class c1 = field.getType();
            String type = c1.getName();
        }
        //------------------------------我即将抽取的------------------------//
    }

}

public class Demo {
    private static void getInfo(Object obj) {
        Class<?> clazz = obj.getClass();
        Method[] methods = clazz.getMethods();
        for (Method method : methods) {
            String name = method.getName();
            Class<?> returnType = method.getReturnType();
            Class<?>[] parameterTypes = method.getParameterTypes();
        }
    //-----------------------------我即将抽取的-------------------------//
    Field[] declaredFields = clazz.getDeclaredFields();
    for (Field field : declaredFields) {
        String name = field.getName();
        Class c1 = field.getType();
        String type = c1.getName();
    }
    //------------------------------我即将抽取的------------------------//
}

}

选中我即将抽取的代码，按快捷键Ctrl + Alt + M 即可，或者  鼠标右击 》Refactor 》Extract 》Method 出现如下

抽取后自动生成代码如下，后续此方法就可以方便的被调用了

public class Demo {
    private static void getInfo(Object obj) {
        Class<?> clazz = obj.getClass();
        Method[] methods = clazz.getMethods();
        for (Method method : methods) {
            String name = method.getName();
            Class<?> returnType = method.getReturnType();
            Class<?>[] parameterTypes = method.getParameterTypes();
        }

        //-----------------------------我即将抽取的-------------------------//
        commonDeal(clazz);
        //------------------------------我即将抽取的------------------------//
    }

    private static void commonDeal(Class<?> clazz) {
        Field[] declaredFields = clazz.getDeclaredFields();
        for (Field field : declaredFields) {
            String name = field.getName();
            Class c1 = field.getType();
            String type = c1.getName();
        }
    }

}

public class Demo {

private static void getInfo(Object obj) {

Class<?> clazz = obj.getClass();

Method[] methods = clazz.getMethods();

for (Method method : methods) {

String name = method.getName();

Class<?> returnType = method.getReturnType();

Class<?>[] parameterTypes = method.getParameterTypes();

}

    //-----------------------------我即将抽取的-------------------------//
    commonDeal(clazz);
    //------------------------------我即将抽取的------------------------//
}

private static void commonDeal(Class&lt;?&gt; clazz) {
    Field[] declaredFields = clazz.getDeclaredFields();
    for (Field field : declaredFields) {
        String name = field.getName();
        Class c1 = field.getType();
        String type = c1.getName();
    }
}

}

对应的还有变量的抽取、常量的抽取等，看下图，这是鼠标右击 》Refactor 》Extract 操作后出现的效果，里面包含很多的抽取：