Math.log1p()

Math.log1p(input_number)

System.out.println(Math.log(5));    //1.6094379124341003 
System.out.println(Math.log1p(4));    //1.6094379124341003
System.out.println(Math.log1p(0));    //0.0
System.out.println(Math.log1p(-1));   //-Infinity
System.out.println(Math.log(4.12));   //1.415853163361435
System.out.println(Math.log1p(3.12)); //1.415853163361435