new Table example

java/examples/Topics/Advanced Data/LoadSaveTable/LoadSaveTable.pde

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+/**
+ * Loading Tabular Data
+ * by Daniel Shiffman.  
+ * 
+ * This example demonstrates how to use loadTable()
+ * to retrieve data from a CSV file and make objects 
+ * from that data.
+ *
+ * Here is what the CSV looks like:
+ *
+   x,y,diameter,name
+   160,103,43.19838,Happy
+   372,137,52.42526,Sad
+   273,235,61.14072,Joyous
+   121,179,44.758068,Melancholy
+ */
+ 
+// An Array of Bubble objects
+Bubble[] bubbles;
+// A Table object
+Table table;
+
+void setup() {
+  size(640, 360);
+  loadData();
+}
+
+void draw() {
+  background(255);
+  // Display all bubbles
+  for (Bubble b : bubbles) {
+    b.display();
+    b.rollover(mouseX, mouseY);
+  }
+
+  textAlign(LEFT);
+  fill(0);
+  text("Click to add bubbles.", 10, height-10);
+}
+
+void loadData() {
+  // Load CSV file into a Table object
+  // "header" option indicates the file has a header row
+  table = loadTable("data.csv","header");
+
+  // The size of the array of Bubble objects is determined by the total number of rows in the CSV
+  bubbles = new Bubble[table.getRowCount()]; 
+
+  // You can access iterate over all the rows in a table
+  int rowCount = 0;
+  for (TableRow row : table.rows()) {
+    // You can access the fields via their column name (or index)
+    float x = row.getFloat("x");
+    float y = row.getFloat("y");
+    float d = row.getFloat("diameter");
+    String n = row.getString("name");
+    // Make a Bubble object out of the data read
+    bubbles[rowCount] = new Bubble(x, y, d, n);
+    rowCount++;
+  }  
+
+}
+
+void mousePressed() {
+  // Create a new row
+  TableRow row = table.addRow();
+  // Set the values of that row
+  row.setFloat("x", mouseX);
+  row.setFloat("y", mouseY);
+  row.setFloat("diameter", random(40, 80));
+  row.setString("name", "Blah");
+
+  // Writing the CSV back to the same file
+  saveTable(table,"data/data.csv");
+  // And reloading it
+  loadData();
+}
+