Throwing exception makes window freeze

[idlackage]

I have some code to draw shapes, and I want to check that the number of shapes drawn are not over the amount of room in the array.

// In the constructor:
// shapeObjects = new Shape[ 10 ]; // Example length of array contains ten shapes
// numOfShapes = 0;

public void paintComponent( Graphics g ) {
    
    // Inherit the paintComponent method from the superclass
    super.paintComponent( g );
    
    try {
      
      // Check whether or not the shape array is already full
      if( numOfShapes == shapeObjects.length ) {
        throw new ArrayIndexOutOfBoundsException();
      } else {
        // If shape is null, do nothing
        if ( shape == null ) {
          return;
        } else {
          // Otherwise, draw the shapes
          for( int i = 0; i < numOfShapes; i++ ) {
            shapeObjects[i].draw( g );
          }
          shape.draw( g );
        }
      }
      
    } catch( ArrayIndexOutOfBoundsException arrayIndexOutOfBoundsException ) {
      JOptionPane.showMessageDialog( null, "Number of shapes drawn cannot exceed 100.", "Error", JOptionPane.ERROR_MESSAGE );
    }
    
  }

Screenshot of the freezing if necessary: image

[jkmyoung]

Are you sure it doesn't just clear the component? If you throw the exception, none of them redraw.

Are you getting the error window?