@Test public void testExpression() { Expression e = new Expression("=", "abc", "d"); Assert.assertEquals(e.getVal(), Double.valueOf(0)); }
public Expression() { this.operator = "="; this.display = ""; }
Expression { public Expression() { this.operator = "="; this.display = ""; } }
Expression { public Expression() { this.operator = "="; this.display = ""; } Expression();  Expression(String op, String val, String dis); }
Expression { public Expression() { this.operator = "="; this.display = ""; } Expression();  Expression(String op, String val, String dis); void setOperator(String op); String getOperator(); void setVal(Double val); Double getVal(); void setDisplay(String display); String getDisplay(); }
Expression { public Expression() { this.operator = "="; this.display = ""; } Expression();  Expression(String op, String val, String dis); void setOperator(String op); String getOperator(); void setVal(Double val); Double getVal(); void setDisplay(String display); String getDisplay();  }