for loops instead of if else statement [closed] - if-statement

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program:
what else can I use in this program instead of using multiple if else statement
my desire number is until a thousand.
do {
System.out.print("Enter number: ");
a=Integer.parseInt(br.readLine());
if(a==1)
System.out.println(o[0]);
if(a==2)
System.out.println(o[1]);
if(a==3)
System.out.println(o[2]);
if(a==4)
System.out.println(o[3]);
if(a==5)
System.out.println(o[4]);
if(a==6)
System.out.println(o[5]);
}
while(a!=0);
if (a==0){
System.out.println("You entered number zero");
}

Answer 1

do {
System.out.print("Enter number: ");
a = Integer.parseInt(br.readLine());
if (a != 0 && a < o.length) {
System.out.println(o[a-1]);
}
} while(a != 0);
if (a == 0) {
System.out.println("You entered number zero");
}

Answer 2

Start by analyzing the pattern: given if(a==X) System.out.println(o[Y]);, what is the relation of X (and therefor a) to Y?
Now eliminate all the if-else statements to take this into account - the program should be left with a single System.out.println(o[..]); line (where the expression .. transforms a by the pattern identified above).
Then, what is the domain of X (and a by extension)? That is, for what values of X should this println operation occur?
Add an if statement around the above println; this will prevent output when the user enters 0 (or 7), for instance.