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public class Person{
	private int age;
	public void setAge(int age){
		if (age < 0){
			throw new RuntimeException("年龄不能为负数...");
		}
		this.age = age;
	}
}
class Demo{
	public static void main(String args[]){
		Person p = new Person();
		p.setAge(-1);
	}
}
运行结果：
Exception in thread "main" java.lang.RuntimeException: 年龄不能为负数...
	at Person.setAge(Person.java:5)
	at Demo.main(Demo.java:4)

public class Person{ private int age; public void setAge(int age){ if (age < 0){ throw new RuntimeException("年龄不能为负数..."); } this.age = age; } } class Demo{ public static void main(String args[]){ Person p = new Person(); p.setAge(-1); } } 运行结果： Exception in thread "main" java.lang.RuntimeException: 年龄不能为负数... at Person.setAge(Person.java:5) at Demo.main(Demo.java:4)