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Task/Variables/Apex/variables.apex

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+// If not initialized at class/member level, it will be set to null
+Integer x = 0;
+Integer y; // y is null here
+Integer p,q,r; // declare multiple variables
+Integer i=1,j=2,k=3; // declare and initialize
+
+/*
+ * Similar to Integer, below variables can be initialized together separated by ','.
+*/
+String s = 'a string';
+Decimal d = 0.0;
+Double dbl = 0.0;
+Blob blb = Blob.valueOf('Any String');
+Boolean b = true;
+AClassName cls = new AClassName();