{"id":865,"date":"2016-02-29T06:54:12","date_gmt":"2016-02-29T06:54:12","guid":{"rendered":"http:\/\/abhiandroid.com\/java\/?p=865"},"modified":"2018-06-05T06:16:21","modified_gmt":"2018-06-05T06:16:21","slug":"constructor-chaining","status":"publish","type":"post","link":"https:\/\/abhiandroid.com\/java\/constructor-chaining.html","title":{"rendered":"Constructor Chaining In Java With Example"},"content":{"rendered":"

Constructor Chaining is a process of calling the one constructor from another constructor with respect to current object. Whenever we want constructor to duplicate some of the behavior of an existing constructor we use constructor chaining. In the same class referring to another constructor we use this<\/strong> as the method name, followed by appropriate arguments enclosed in pair of parenthesis, if necessary. Java requires that the call to this()<\/strong> can be used in a constructor and must be the first statement in the constructor followed by any other relevant code.<\/p>\n

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Program Example of Constructor Chaining:<\/strong><\/h4>\n

Let us consider a example to show use of constructor chaining.<\/p>\n

Step 1: <\/strong><\/span>First create a class Temp <\/strong>in which we take three constructors:<\/p>\n

class Temp\r\n\r\n{\r\n\r\n  Temp()  \/\/default constructor\r\n\r\n  {\r\n\r\n    this(10);\r\n    System.out.println(\"default constructor\");\r\n\r\n  }\r\n\r\n  Temp(int x)  \/\/one parameter constructor\r\n\r\n  {\r\n\r\n    this(10,20);\r\n    System.out.println(\"value of x is\" +x);\r\n\r\n  }\r\n\r\n  Temp(int x,int y)  \/\/two parameter constructor\r\n\r\n  {\r\n\r\n    System.out.println(\"Add result is\" +(x+y));\r\n\r\n  }\r\n\r\n  public static void main(String[] args)\r\n\r\n  {\r\n\r\n    new Temp();\r\n\r\n  }\r\n\r\n}<\/pre>\n
Output:<\/strong><\/p>\n
Add result is 30\r\nValue of x is 10\r\nDefault constructor<\/pre>\n
Explanation of Program:<\/strong><\/p>\n