java:member_initialization
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| Both sides previous revision Previous revision | Next revision Both sides next revision | ||
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java:member_initialization [2016/02/19 14:09] doufexi [Static Initialization Blocks] |
java:member_initialization [2016/02/19 14:22] doufexi fixed contructor, added toc link |
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| Line 91: | Line 91: | ||
| private static int numberOfRectangles = initNumberOfRectangles(); | private static int numberOfRectangles = initNumberOfRectangles(); | ||
| | | ||
| - | // the Rectangle class has one constructor | + | public Rectangle(int initWidth, int initHeight, Point initOrigin) { |
| - | public Rectangle(int setWidth, int setHeight, Point o) { | + | this(initHeight, initHeight); |
| - | this(setWidth, setHeight); | + | origin = initOrigin; |
| - | origin = o; | + | |
| } | } | ||
| | | ||
| - | public Rectangle(int setWidth, int setHeight) { | + | public Rectangle(int initWidth, int initHeight) { |
| - | width = setWidth; | + | width = initWidth; |
| - | height = setHeight; | + | height = initHeight; |
| + | origin = new Point(0,0); | ||
| id = ++numberOfRectangles; | id = ++numberOfRectangles; | ||
| - | System.out.println("Initialized object id in constructor, id:"+id); | + | System.out.println("Initialized object id in constructor, id:" + id); |
| } | } | ||
| | | ||
| Line 120: | Line 120: | ||
| { | { | ||
| id = 100; | id = 100; | ||
| - | System.out.println("initialize objectId in block, id: "+id); | + | System.out.println("initialize objectId in block, id: " + id); |
| } | } | ||
| | | ||
| Line 126: | Line 126: | ||
| private final int initializeId() { | private final int initializeId() { | ||
| int _id = 200; | int _id = 200; | ||
| - | System.out.println("initialize objectId in final method, id: "+_id ); | + | System.out.println("initialize objectId in final method, id: " + _id ); |
| return _id; | return _id; | ||
| } | } | ||
| Line 138: | Line 138: | ||
| } | } | ||
| | | ||
| - | // the Rectangel class has 3 methods | ||
| public void setWidth(int newWidth ) { | public void setWidth(int newWidth ) { | ||
| width = newWidth; | width = newWidth; | ||
| Line 155: | Line 154: | ||
| } | } | ||
| | | ||
| - | public void setOrigin(Point o) { | + | public void setOrigin(Point newOrigin) { |
| - | origin = o; | + | origin = newOrigin; |
| } | } | ||
| | | ||
| Line 174: | Line 173: | ||
| | | ||
| public String toString(String objName) { | public String toString(String objName) { | ||
| - | return "["+objName+"."+id+"] Width: "+width+", Height: "+height+", Origin: "+origin; | + | return "["+objName+"." + id + "] Width: " + width + ", Height: " + height + ", Origin: " + origin; |
| } | } | ||
| | | ||
| Line 183: | Line 182: | ||
| System.out.println(rectOne.toString("rectOne")); | System.out.println(rectOne.toString("rectOne")); | ||
| System.out.println("-------------------------------"); | System.out.println("-------------------------------"); | ||
| - | System.out.println("Number of Rectangles: "+getNumberOfRectangles() ); | + | System.out.println("Number of Rectangles: " + getNumberOfRectangles() ); |
| } | } | ||
| } | } | ||
| </code> | </code> | ||
| - | Το αποτέλεσμα εκτέλεσης το παραπάνω κώδικα είναι το παρακάτω: | + | Το αποτέλεσμα εκτέλεσης του παραπάνω κώδικα είναι το παρακάτω: |
| <code> | <code> | ||
| $ java Rectangle | $ java Rectangle | ||
| Line 202: | Line 201: | ||
| </code> | </code> | ||
| - | |Προηγούμενο: [[:java:static_keyword | Στατικές μεταβλητές και μέθοδοι ]] | Επόμενο: [[ :java:access_modifiers | Περιοριστές πρόσβασης ]]| | + | |Προηγούμενο: [[:java:static_keyword | Στατικές μεταβλητές και μέθοδοι ]] | [[ :toc | Περιεχόμενα ]] | Επόμενο: [[ :java:access_modifiers | Περιοριστές πρόσβασης ]]| |
java/member_initialization.txt · Last modified: 2017/02/16 11:29 by gthanos
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