How do I check whether the course is present or not ?

Question

1.00/5 (1 vote)

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public class Coursecheck {
public static void main(String args[])
{
String co[]=new String[9];
String ser=" ";
int flag=0;
Scanner s=new Scanner(System.in);
System.out.println("enter sub");
for(int i=0;i<3;i++)
	co[i]=s.nextLine();
System.out.println("enter search");
ser=s.nextLine();
for(int j=0;j<3;j++) {
	if(ser==co[j])
	{
		
		flag=1;
		break;
	}
}
if(flag!=1)
	System.out.println("course is not present");
else
	System.out.println("course is present");
}
}

What I have tried:

for(int j=0;j<3;j++) {
	if(ser==co[j])
	{
		
		flag=1;
		break;
	}
}
if(flag!=1)
	System.out.println("course is not present");
else
	System.out.println("course is present");

Everytime it's printing "course is not available" however it's available.What's wrong in the logic?

Posted 2-Jul-19 10:16am

Member 13954890

Updated 2-Jul-19 10:37am

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raddevus · Accepted Answer · 2019-07-02T10:38:00

complete guess:
Is it possible that the following line of code is never true?

Java

if(ser==co[j])

ah, yes it is possible. NOw that I look at it closer you are doing ser (string)
comparison but the comparison in that line actually compares the two objects (and they are never equal.
Then, since it is never true, the flag never gets set to 1.

You have to do string comparison differently in Java. Change line to:

Java

if(ser.equals(co[j]))