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Java 方法的访问控制
方法的访问控制
实例源码：
源代码：
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public class DeltaOne {3
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public static void main(String[] args) {5
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Alpha a = new Alpha();7
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//a.privateMethod(); //illegal/* 来自 NowJava.com - 时 代 Java*/9
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a.packageMethod(); //legal11
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a.protectedMethod(); //legal13
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a.publicMethod(); //legal15
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//System.out.format("privateVariable: %2d%n",18
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// a.privateVariable); //illegal20
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System.out.format("packageVariable: %2d%n", a.packageVariable); //legal22
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System.out.format("protectedVariable: %2d%n", a.protectedVariable); //legal24
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System.out.format("publicVariable: %2d%n", a.publicVariable); //legal26
/**27
from28
* n o w j a v a . c o m 29
**/30
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}32
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}34
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class Alpha {36
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//member variables39
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private int privateVariable = 1;41
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int packageVariable = 2; //default access43
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protected int protectedVariable = 3;45
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public int publicVariable = 4;47
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//methods50
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private void privateMethod() {52
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System.out.format("privateMethod called%n");54
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}56
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void packageMethod() { //default access59
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System.out.format("packageMethod called%n");61
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}63
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protected void protectedMethod() {66
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System.out.format("protectedMethod called%n");68
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}70
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public void publicMethod() {73
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System.out.format("publicMethod called%n");75
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}77
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public static void main(String[] args) {80
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Alpha a = new Alpha();82
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a.privateMethod(); //legal84
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a.packageMethod(); //legal86
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a.protectedMethod(); //legal88
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a.publicMethod(); //legal90
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System.out.format("privateVariable: %2d%n", a.privateVariable); //legal93
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System.out.format("packageVariable: %2d%n", a.packageVariable); //legal95
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System.out.format("protectedVariable: %2d%n", a.protectedVariable); //legal97
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System.out.format("publicVariable: %2d%n", a.publicVariable); //legal99
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}101
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}103
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/*106
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* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.108
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*110
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* Redistribution and use in source and binary forms, with or without112
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* modification, are permitted provided that the following conditions114
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* are met:116
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*118
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* - Redistributions of source code must retain the above copyright120
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* notice, this list of conditions and the following disclaimer.122
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*124
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* - Redistributions in binary form must reproduce the above copyright126
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* notice, this list of conditions and the following disclaimer in the128
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* documentation and/or other materials provided with the distribution.130
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*132
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* - Neither the name of Oracle or the names of its134
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* contributors may be used to endorse or promote products derived136
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* from this software without specific prior written permission.138
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*140
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS142
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,144
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR146
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