How to pass multiple array to constructor in java?

Question

I have a problem passing a multiple array to constructor. Can we actually do that or not?

public class First {
public String[] a;
public String[] b;
public First(String[] a, String[] b){
    this.a=a;
    this.b=b;
}
}

And the next code is where I'm using class First.

Scanner ss =  new Scanner(System.in); 
int x; 
System.out.print("How many lines? "); 
x = ss.nextInt();
for(int i=0; i<x; i++){
System.out.print("A: "); a[i]=ss.nextString();
System.out.print("B: "); b[i]=ss.nextString();
}
First ff= new First(a,b);

In NetBeans, there is no error, but I can't use it in another class.

I'd be thankful if you would help me.

Ken Slade · Accepted Answer · 2015-12-06 04:12:59Z

1

There is nothing wrong with passing in multiple arrays to a Java constructor. However, you may want to consider making copies of the arrays that you are passing in (with Arrays.copyOf()). You should also seriously consider making your actual array data private or protected.

edited Dec 6, 2015 at 4:12

answered Dec 6, 2015 at 4:07

Ken Slade

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Comments

kaushik · Accepted Answer · 2015-12-06 04:13:11Z

0

The Question is not cleared. You cant use it on another class means. PLease clear your question.. But below code is working fine.. you can check it out.

public class MultipleArr {

String a[];
String b[];
public MultipleArr(String[] a, String[] b)
{
    this.a=a;
    this.b=b;
}

public static void main(String[] args) {

    String [] a={"1","2","3"};
    String [] b={"2","2","3"};

    MultipleArr arr=new MultipleArr(a,b);

    for(int i=0;i<arr.a.length;i++)
    {
        System.out.println(arr.a[i]);
    }

    for(int i=0;i<arr.b.length;i++)
    {
        System.out.println(arr.b[i]);
    }

}

}

answered Dec 6, 2015 at 4:13

kaushik

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1 Comment

Embek Over a year ago

I mean im gonna make the program input from user instead of we put the value from the first time.

Scanner ss =  new Scanner(System.in);  int x;  System.out.print("How many lines? "); x = ss.nextInt();   for(int i=0; i<x; i++){   	System.out.print("A: "); a[i]=ss.nextString();  	System.out.print("B: "); b[i]=ss.nextString();  }  First ff= new First(a,b);

kaushik · Accepted Answer · 2015-12-06 07:39:37Z

public class MultipleArr {

String a[];
String b[];
public MultipleArr(String[] a, String[] b)
{
    this.a=a;
    this.b=b;
}

public static void main(String[] args) {

    String [] a;
    String [] b;

    Scanner ss = new Scanner(System.in); 
    int x; 
    System.out.print("How many lines? "); 
    x = ss.nextInt();

    a=new String[x];
    System.out.print("A: ");
    for(int i=0; i<x; i++)
    { 

       a[i]=ss.next();
    }

    b=new String[x];
    System.out.print("B: ");
    for(int i=0; i<x; i++)
    { 

       b[i]=ss.next();
    }


    MultipleArr arr=new MultipleArr(a,b);

    for(int i=0;i<arr.a.length;i++)
    {
        System.out.println(arr.a[i]);
    }

    for(int i=0;i<arr.b.length;i++)
    {
        System.out.println(arr.b[i]);
    }

}

}

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