java怎么样将键盘输入的转换为整型?

[badroot19840811]

import java.lang.*;

class IOShuRu{
public static void main(String args[]) throws java.io.IOException{

int a,b,sum=0;
a=5;
sum=0;
System.out.println("Please input a :\n");
b=System.in.read();

a=++b;
sum=a+b;
System.out.println("The a is:"+a);
System.out.println("The b is:"+b);
System.out.println("The sum is:"+sum);
}
}

输入4后得到的答案是53,53,106
而我想要的是5,5,10
怎么改?

[lixiaoxue85]

Integer.parse("123")

[雨中的看客]

Integer.parseInt("1111")

[badroot19840811]

给的答案出错

[dr_lou]

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int n = Integer.parseInt(br.readLine());

[dr_lou]

try 一下 数据转换异常阿