This week's book giveaway is in the Kotlin forum.
We're giving away four copies of Kotlin for Android App Development and have Peter Sommerhoff on-line!
See this thread for details.
Win a copy of Kotlin for Android App Development this week in the Kotlin forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Liutauras Vilda
  • Devaka Cooray
  • Jeanne Boyarsky
  • Bear Bibeault
Sheriffs:
  • Junilu Lacar
  • Paul Clapham
  • Knute Snortum
Saloon Keepers:
  • Ron McLeod
  • Tim Moores
  • Stephan van Hulst
  • salvin francis
  • Carey Brown
Bartenders:
  • Tim Holloway
  • Frits Walraven
  • Ganesh Patekar

matrix array  RSS feed

 
Ranch Hand
Posts: 31
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
hi all,
i have defined a class "matrix" by my self, i wanna have an array of matrix, the code is in the following:
....
matrix[][] m=new matrix[20][15];
for(int i=0;i<20;i++)
for(int j=0;j<20;j++)
m[i][j] = new matrix();
....
class matrix
{
public int type;
public int NodeNo;
public matrix()
{
type=0;
NodeNo =0;
}
void settype(int t)
{
type =t;
}
void setNodeNo(int n)
{
NodeNo =n;
}
}
Problem : there's no compiling error, but there will be arrayIndexOutOfBoundsException ....
Anybody can help me?
thanks
dejie
 
Ranch Hand
Posts: 375
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Dejie,
j will max out at 14 so j < 20 is gonna throw an exception, it should read j < 15.
A better approach would be -

I don't think I have got this wrong, but do check, no JVM on this machine.
HTH
Ashish Hareet
 
All of the world's problems can be solved in a garden - Geoff Lawton. Tiny ad:
RavenDB is an Open Source NoSQL Database that’s fully transactional (ACID) across your database
https://coderanch.com/t/704633/RavenDB-Open-Source-NoSQL-Database
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!