Type the following in a Java buffer:
class X
{
String field1;
String[] field2;
int field3;
int[] field4;
X field5;
X[] field6;
}
Select the six field lines and 'M-x align' them:
class X
{
String field1;
String[] field2;
int field3;
int[] field4;
X field5;
X[] field6;
}