In this tutorial we will learn Method Overloading in Java with example.
Overloading is an example of polymorphism (OOPS concept) , Where we should have more than one method with same name but should have different input parameters or different datatype.
Below we have two methods with same name but different input parameters
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">int</span> x<span class="token punctuation">,</span> <span class="token keyword">int</span> y<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> x <span class="token operator">+</span> y<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">int</span> x<span class="token punctuation">,</span> <span class="token keyword">int</span> y<span class="token punctuation">,</span> <span class="token keyword">int</span> z<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> x <span class="token operator">+</span> y <span class="token operator">+</span> z<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Maths</span> <span class="token punctuation">{</span>
<span class="token comment">/**
* Method with 2 input parameters
*
* @param x
* @param y
* @return
*/</span>
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">int</span> x<span class="token punctuation">,</span> <span class="token keyword">int</span> y<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> x <span class="token operator">+</span> y<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">/**
* method with 3 input parameters with same data type
*
* @param x
* @param y
* @param z
* @return
*/</span>
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">int</span> x<span class="token punctuation">,</span> <span class="token keyword">int</span> y<span class="token punctuation">,</span> <span class="token keyword">int</span> z<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> x <span class="token operator">+</span> y <span class="token operator">+</span> z<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">/**
* Method with 3 input parameters with different data type
*
* @param x
* @param y
* @param z
* @return
*/</span>
<span class="token keyword">public</span> <span class="token keyword">float</span> <span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">int</span> x<span class="token punctuation">,</span> <span class="token keyword">int</span> y<span class="token punctuation">,</span> <span class="token keyword">float</span> z<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> x <span class="token operator">+</span> y <span class="token operator">+</span> z<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token class-name">Maths</span> math <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Maths</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// Creating object</span>
<span class="token keyword">int</span> sum <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">sum</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">// calling sum method with 2 input parameters</span>
<span class="token keyword">int</span> threeParameter <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">sum</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// Calling sum method with 3 parameters</span>
<span class="token keyword">float</span> floatSum <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">sum</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">,</span> <span class="token number">10.6F</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// Calling sum method with different data types</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Result of 2 Parameters "</span> <span class="token operator">+</span> sum<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Result of 3 Parameters "</span> <span class="token operator">+</span> threeParameter<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Result of 3 Parameters with different data types "</span> <span class="token operator">+</span> floatSum<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>Output
Result of 2 Parameters 20
Result of 3 Parameters 30
Result of 3 Parameters with different data types 40.6Download
https://github.com/rkumar9090/BeginnersBug/blob/master/BegineersBug/src/com/geeks/example/Maths.java