Java 用字段和方法创建一个类
用字段和方法创建一个类
实例源码：
源代码：
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class BicycleDemo {3
/**4
* 时 代 J a v a 公 众 号 - N o w J a v a . c o m 提 供 5
**/6
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public static void main(String[] args) {8
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// Create two different 11
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// Bicycle objects13
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Bicycle bike1 = new Bicycle();15
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Bicycle bike2 = new Bicycle();17
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// Invoke methods on 20
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// those objects22
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bike1.changeCadence(50);24
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bike1.speedUp(10);26
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bike1.changeGear(2);28
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bike1.printStates();30
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bike2.changeCadence(50);33
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bike2.speedUp(10);35
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bike2.changeGear(2);37
/**38
nowjava - 时 代 Java 提供 39
**/40
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bike2.changeCadence(40);42
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bike2.speedUp(10);44
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bike2.changeGear(3);46
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bike2.printStates();48
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}50
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}52
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class Bicycle {54
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int cadence = 0;57
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int speed = 0;59
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int gear = 1;61
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void changeCadence(int newValue) {64
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cadence = newValue;66
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}68
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void changeGear(int newValue) {71
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gear = newValue;73
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}75
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void speedUp(int increment) {78
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speed = speed + increment;80
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}82
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void applyBrakes(int decrement) {85
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speed = speed - decrement;87
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}89
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void printStates() {92
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System.out.println("cadence:" + cadence + " speed:" + speed94
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+ " gear:" + gear);96
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}98
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}100
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/*103
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* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.105
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*107
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* Redistribution and use in source and binary forms, with or without109
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* modification, are permitted provided that the following conditions111
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* are met:113
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*115
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* - Redistributions of source code must retain the above copyright117
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* notice, this list of conditions and the following disclaimer.119
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*121
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* - Redistributions in binary form must reproduce the above copyright123
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* notice, this list of conditions and the following disclaimer in the125
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* documentation and/or other materials provided with the distribution.127
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*129
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* - Neither the name of Oracle or the names of its131
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* contributors may be used to endorse or promote products derived133
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* from this software without specific prior written permission.135
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*137
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS139
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,141
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR143
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR145
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