System.out.println(1+1);
System.out.println(1 + 3 + "16"); //416 System.out.println("16" + 1 + 3); //1613 System.out.println('a' + 3 + "16"); //10016 以后看到char当int计算 System.out.println(1.0 + 3 + "16"); //4.016