iBegin Java

i m finding a little bit problem in the last codding .
@@@@@

import java.util.scanner;
class calculator
{
public static void main(Strng args[])
{
Scanner user_input = new Scanner(System.in);
double ch;
int ch;

System.out.println("1. addition");
System.out.println("2. subtratcion");
System.out.println("3. multiplication");
System.out.println("4. division");
System.out.println("choose your operator:");
ch = user_input.nextInt(" ");

if (ch ==1)
{
System.out.println("you chose addition ");
System.out.println("entre the first no;");
x = user_input.nextDouble();

System.out.println("entre the second no");
y = user_input.nextDouble();

z = x+y;
System.out.println(z);
}
else if (ch==2)
{
System.out.println("you chose subtraction");
System.out.println("entre first no");
x = user_input.nextdouble();

System.out.println("entre the second no");
y = user_input.nextDouble();

z = x-y;
System.out.println(z);
}
else if(ch==3);
{
System.out.println("your operation is multiplication");
System.out.println("entre the first no");
x = user_input.nextDouble();

System.out.println("entre the second no");
y = user_input.nextDouble();

z = x*y;
System.out.println(z);
}
else if(ch==4);
{
System.out.println("your operation is division");
System.out.println("entre the first no");
x = user_input.nextDouble();

System.out.println("entre the second no");
y = user_input.nextDouble();

z = x/y;
System.out.println(z);
}
else
{
System.out.println("you can choose only 1--4 ");
}
}
}

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