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static X x1; public X x1=new X(int 123) Y x1; X x1=X ();
X1 X2 (X1,X2) (X1,X2,X3,X4)
{X1},{X1X2},{X1X3} {X1},{X1X3} {X1} {X2},{X3}
X1 X2 (X1,X2) (X1,X2,X3,X4)
{X1},{X1X2},{X1X3} {X1},{X1X3} {X1} {X2},{X3}
X1 X2 (X1,X2) (X1,X2,X3,X4)
X0/X1≥4~5 X0/X1>3 X0/X1≤4~5 X0/X1<3
static X x1 public X x1=new X(int 123); Y x1; X x1;X( );
X0/X1≥4~5 X0/X1>3 X0/X1≤4~5 X0/X1<3
public x x1=new y(); x x1:x(); x x1=new x(); int x x1;