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方法的访问控制
public class DeltaOne { public static void main(String[] args) { Alpha a = new Alpha(); //a.privateMethod(); //illegal/* 来自 NowJava.com - 时 代 Java*/ a.packageMethod(); //legal a.protectedMethod(); //legal a.publicMethod(); //legal //System.out.format("privateVariable: %2d%n", // a.privateVariable); //illegal System.out.format("packageVariable: %2d%n", a.packageVariable); //legal System.out.format("protectedVariable: %2d%n", a.protectedVariable); //legal System.out.format("publicVariable: %2d%n", a.publicVariable); //legal /** from * n o w j a v a . c o m **/ } } class Alpha { //member variables private int privateVariable = 1; int packageVariable = 2; //default access protected int protectedVariable = 3; public int publicVariable = 4; //methods private void privateMethod() { System.out.format("privateMethod called%n"); } void packageMethod() { //default access System.out.format("packageMethod called%n"); } protected void protectedMethod() { System.out.format("protectedMethod called%n"); } public void publicMethod() { System.out.format("publicMethod called%n"); } public static void main(String[] args) { Alpha a = new Alpha(); a.privateMethod(); //legal a.packageMethod(); //legal a.protectedMethod(); //legal a.publicMethod(); //legal System.out.format("privateVariable: %2d%n", a.privateVariable); //legal System.out.format("packageVariable: %2d%n", a.packageVariable); //legal System.out.format("protectedVariable: %2d%n", a.protectedVariable); //legal System.out.format("publicVariable: %2d%n", a.publicVariable); //legal } }