java charAt返回char,不是int

String strs="012345";
System.out.println(strs.charAt(1));       //输出？我就输出1
if(strs.charAt(1)==1)System.out.println("char equals int");     //但我并不等于1
if(strs.charAt(1)==(1+'0'))System.out.println("char do not equal int");      //我等于49
if(strs.charAt(1)==49)System.out.println("char do not equal int");      //我等于49
System.out.println((char)49);         //1