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                # Java 中的局部變量 > 原文: [https://javabeginnerstutorial.com/core-java-tutorial/local-variable-in-java/](https://javabeginnerstutorial.com/core-java-tutorial/local-variable-in-java/) 讓我們進一步了解 Java 中的局部變量。 在 Java 程序的方法中聲明的變量稱為局部變量。 ## 局部變量規則 * 局部變量不能使用任何[訪問級別](https://javabeginnerstutorial.com/core-java-tutorial/access-modifier-in-java/ "Access Modifiers in Java"),因為它的范圍僅在方法內部。 * `final`是唯一可以應用于局部變量的[非訪問修飾符](https://javabeginnerstutorial.com/core-java-tutorial/non-access-modifiers-in-java/ "Non Access Modifiers in Java")。 * 局部變量未分配默認值,因此需要對其進行初始化。 ## 局部變量示例 ```java package com.jbt; /* * Here we will discuss about different type of Variables available in Java */ public class VariablesInJava { /* * Below variable is INSTANCE VARIABLE as it is outside any method and it is * not using STATIC modifier with it. It is using default access modifier. * To know more about ACCESS MODIFIER visit appropriate section */ int instanceField; /* * Below variable is STATIC variable as it is outside any method and it is * using STATIC modifier with it. It is using default access modifier. To * know more about ACCESS MODIFIER visit appropriate section */ static String staticField; public void method() { /* * Below variable is LOCAL VARIABLE as it is defined inside method in * class. Only modifier that can be applied on local variable is FINAL. * To know more about access and non access modifier visit appropriate * section. * * Note* : Local variable needs to initialize before they can be used. * Which is not true for Static or Instance variable. */ final String localVariable = "Initial Value"; System.out.println(localVariable); } public static void main(String args[]) { VariablesInJava obj = new VariablesInJava(); /* * Instance variable can only be accessed by Object of the class only as below. */ System.out.println(obj.instanceField); /* * Static field can be accessed in two way. * 1- Via Object of the class * 2- Via CLASS name */ System.out.println(obj.staticField); System.out.println(VariablesInJava.staticField); } } ``` ```java public class UserController { // Instance variable private String outsideVariable; public void setLength() { //Local variable String localVariable = "0"; // In order to use below line local variable needs to be initialzed System.out.println("Value of the localVariable is-"+localVariable); } } ``` ## 命名約定 命名局部變量沒有特定的規則。 所有變量規則都適用于局部變量。 下面提到的是命名局部變量的規則。 * 變量名稱區分大小寫。 * 局部變量的長度沒有限制。 * 如果變量名只有一個單詞,則所有字符均應小寫。 ### 重點 * 局部變量不能使用任何訪問級別,因為它們僅存在于方法內部。 * `Final`是唯一可以應用于局部變量的非訪問修飾符。 * 局部變量沒有默認值,因此必須先啟動局部變量,然后才能使用它們。
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