Java 实例字段与静态字段
实例字段与静态字段
实例源码：
源代码：
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import java.util.*;/**来 自 n o w j a v a . c o m**/3
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public class AClass {6
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public int instanceInteger = 0;9
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public int instanceMethod() {12
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return instanceInteger;14
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}16
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public static int classInteger = 0;19
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public static int classMethod() {22
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return classInteger;24
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}26
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public static void main(String[] args) {29
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AClass anInstance = new AClass();31
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AClass anotherInstance = new AClass();33
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//Refer to instance members through an instance./**from n o w j a v a . c o m**/36
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anInstance.instanceInteger = 1;38
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anotherInstance.instanceInteger = 2;40
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System.out.format("%s%n", anInstance.instanceMethod());42
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System.out.format("%s%n", anotherInstance.instanceMethod());44
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//Illegal to refer directly to instance members from a class method47
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//System.out.format("%s%n", instanceMethod()); //illegal49
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//System.out.format("%s%n", instanceInteger); //illegal51
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//Refer to class members through the class...54
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AClass.classInteger = 7;56
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System.out.format("%s%n", classMethod());58
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//...or through an instance.61
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System.out.format("%s%n", anInstance.classMethod());63
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//Instances share class variables66
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anInstance.classInteger = 9;68
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System.out.format("%s%n", anInstance.classMethod());70
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System.out.format("%s%n", anotherInstance.classMethod());72
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}74
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}76
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/*79
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* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.81
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*83
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* Redistribution and use in source and binary forms, with or without85
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* modification, are permitted provided that the following conditions87
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* are met:89
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*91
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* - Redistributions of source code must retain the above copyright93
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* notice, this list of conditions and the following disclaimer.95
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*97
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* - Redistributions in binary form must reproduce the above copyright99
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* notice, this list of conditions and the following disclaimer in the101
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* documentation and/or other materials provided with the distribution.103
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*105
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* - Neither the name of Oracle or the names of its107
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* contributors may be used to endorse or promote products derived109
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* from this software without specific prior written permission.111
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*113
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS115
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,117
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR119
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR121
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