equals()

equals()方法

编写order类，有int型的orderid,String型的ordername,相应的getter()和setter()方法，两个参数的构造器，重写父类的euqals()方法：public boolean euqals(Object obj),并判断测试类中创建的两个对象是否相等。

package javasample;

public class order {
	
	public order(int orderid,String ordername) {    //两个参数的构造器
		this.orderid=orderid;
		this.ordername=ordername;
	}
	int orderid;
	String ordername;
	
	public int getOrderid() {
		return orderid;
	}
	public void setOrderid(int orderid) {
		this.orderid = orderid;
	}
	
	public String getOrdername() {
		return ordername;
	}
	public void setOrdername(String ordername) {
		this.ordername = ordername;
	}
	
	@Override          //重写父类的equals()方法，在这里父类是object类
	public boolean equals(Object obj) {
		boolean flag=false;
		if(obj instanceof order) {
			order o=(order) obj;
			
			if(this.orderid==o.orderid&& this.ordername==o.ordername) {
				flag=true;
			}
		}
		
	
		return flag;
	}

}

package javasample;

public class Test {
	public static void main(String argv[]) { 
	order o1=new order(123,"a001");
	order o2=new order(123,"a001");
	
	System.out.println(o1.equals(o2));

}}

结果为 true