单项选择题
class Guy { String greet() { return "hi "; } }
class Cowboy extends Guy { String greet() { return "howdy "; } }
class Wrangler extends Cowboy { String greet() { return "ouch! "; } }
class Greetings2 {
public static void main(String [] args) {
Guy g = new Wrangler();
Guy g2 = new Cowboy();
Wrangler w2 = new Wrangler();
System.out.print(g.greet()+g2.greet()+w2.greet());
}
}
结果是什么?()
A.hi hi ouch!
B.hi howdy ouch!
C.ouch! howdy ouch!
D.编译失败
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相关考题
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单项选择题
JavaSEJDK中类库java.text的用途是哪项?()
A.工具类
B.输出输入支持类
C.文本处理和格式化类
D.结构化查询语言(SQL)支持类 -
单项选择题
class WhileTests { public static void main(String [] args) { int x = 5; while (++x 〈 3) { --x; } System.out.println("x = " + x); } } 结果是什么?()
A.x = 2
B.x = 5
C.x = 6
D.编译失败 -
单项选择题
class DemoApp{ public static void main(String[] args){ int x = 5; int y = ++x + x++; S ystem.out.println(“y=”+y+”,x=”+x); } } 以上程序运行后的输出结果是哪项?()
A.y=10,x=5
B.y=11,x=6
C.y=12,x=7
D.y=11,x=7
