Java Class and Object, Java

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class Rextester
{  
    int height;
    int weight;
    int hairLength;
    
    
    public void run()
    {
        System.out.println("This human can run");
    }
    
    public void walk()
    {
        System.out.println("This human can walk");
    }
    
    public void phisic()
    {
        System.out.println("Human phisic is : " + height+weight);
    }
    
    public static void main(String[] args)
    {
     /*   Rextester boy1 = new Rextester();
        boy1.height = 6;
        boy1.weight = 60;
        boy1.hairLength = 2;
        boy1.run();
        boy1.walk();
        boy1.phisic();
        System.out.println("height : " + boy1.height);
        System.out.println("weight : " + boy1.weight);
        System.out.println("hairLength : " + boy1.hairLength);
        
        System.out.println("**********************************************");
        
        Rextester boy2 = new Rextester();
        boy2.height = 10;
        boy2.weight = 190;
        boy2.hairLength = 9;
        boy2.run();
        boy2.walk();
        boy2.phisic();
        System.out.println("height : " + boy2.height);
        System.out.println("weight : " + boy2.weight);
        System.out.println("hairLength : " + boy2.hairLength); */
        
        
    }
}

[ + ] Show input
Compilation time: 0.74 sec, absolute running time: 0.14 sec, cpu time: 0.07 sec, memory peak: 31 Mb, absolute service time: 0.89 sec