instance variables<\/a>. For example:<\/p>\npublic class Fish {\u00a0<\/span><\/p>\nprivate int weight;\u00a0<\/span><\/p>\nprivate int length;<\/span><\/p>\npublic Fish(int weight, int length) {\u00a0<\/span><\/p>\nthis.weight = weight;\u00a0<\/span><\/p>\nthis.length = \u00a0length;<\/span><\/p>\n}<\/span><\/p>\npublic printInfo() {<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>System.out.println(\u201cThe fish weight is \u201d + weight + \u201c and length is \u201d + length);<\/span><\/p>\n}<\/span><\/p>\npublic static void main (String[] args) {<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>\/\/ creation of our objects with specific field values<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>Fish myFish1 = new Fish (290, 30);<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>Fish myFish2 = new Fish (120, 17);<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>\/\/calling methods to display values of our objects<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>myFish1.printInfo();<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>myFish2.printInfo();<\/span><\/p>\n}<\/span><\/p>\n} <\/span><\/p>\nHere we assign the parameters <\/span>weight<\/span><\/i> and <\/span>length <\/span><\/i>to the instance variable <\/span>weight <\/span><\/i>and<\/span> length<\/span><\/i>. Keyword <\/span>this<\/span><\/i> tells Java that you want to reference an instance variable. In the method <\/span>main <\/span><\/i>we are creating two objects of the class <\/span>Fish <\/span><\/i>with a different value of fields <\/span>weight <\/span><\/i>and<\/span> length<\/span><\/i>. The output of the current code will be:<\/span><\/p>\nThe fish weight is 290 and length is 30
\n<\/span><\/i>The fish weight is 120 and length is 17<\/span><\/i><\/p>\nOverloading of constructors in Java<\/b><\/p>\n
In Java, we can overload all methods, including constructors. Your class can have multiple constructors in the same class, but with a different signature. The name of constructors is always the same since it has to be the same as the name of the class. So constructors must have different parameters in the list and their types in order to be overloaded.<\/span><\/p>\npublic class Mouse() {<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>private int weight;\u00a0<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>private String color;\u00a0<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>public Mouse(int weight) {<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>this.weight = weight;<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>}<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>public Mouse(int weight, String color) {<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>this.weight = weight;<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>this.color = color;<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>}<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>public static void main (String[] args) {<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0Mouse myMouse = new Mouse(350);<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>\u00a0 \u00a0\u00a0<\/span><\/span>Mouse myGrayMouse = new Mouse(350, \u201cgray);<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>}<\/span><\/p>\n} <\/span><\/p>\nOverloaded constructors can call each other. This approach is called <\/span>constructor chaining<\/b>. For example:<\/span><\/p>\npublic class Mouse() {<\/span><\/p>\n\u00a0 \u00a0\u00a0<\/span><\/span>private int weight;\u00a0<\/span><\/p>\n
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