java课程第七天，匿名内部类以及异常处理
利用白富美接口案例，土豪征婚使用匿名内部类对象实现。
//定义女人皮肤白
public interface Iwhite {
public abstract void white();
}
//定义女人有钱
public interface Irich {
public abstract void rich();
}
//定义女人漂亮
public interface Ibeauti {
public abstract void beauti();
}
//定义白富美
public interface IWRB extends Iwhite, Irich, Ibeauti {
}
//定义有钱人娶老婆的标准是白富美
public class richer {
public void marry(IWRB i) {
i.white();
i.rich();
i.beauti();
}
}
public class richerDemo {
public static void main(String[] args) {
richer rm = new richer();
rm.marry(new IWRB() { //实现匿名内部类
public void white() {
System.out.println("我很白，来草我！");
}
public void rich() {
System.out.println("我很有钱，来草我！");
}
public void beauti() {
System.out.println("我很漂亮，来草我！");
}
});
}
}
2.定义三角形类Trianle,里面包含三个int类型属性，分别表示三条边的长度， 造三角形对象时，任意两边之和是否大于第三边，如若不成立，抛出自定义异常。
class EdgeTooSmallException extends Exception { // 这个异常是用来判断边小于或等于0的
private String info;
public EdgeTooSmallException() {
}
public EdgeTooSmallException(String info) {
this.info = info;
}
public String getInfo() {
return info;
}
public void setEdgeInfo(String info) {
this.info = info;
}
}
class EdgeNotMatchException extends Exception { // 这个异常是用来判断三角形的
private String info;
public EdgeNotMatchException() {
}
public EdgeNotMatchException(String info) {
this.info = info;
}
public String getInfo() {
return info;
}
public void setEdgeNotMatchException(String info) {
this.info = info;
}
}
class Triangle {
// 三条边
private int edgea;
private int edgeb;
private int edgec;
// edgea的get/set方法
public int getEdgea() {
return edgea;
}
public void setEdgea(int edgea) throws EdgeTooSmallException {
if (edgea > 0) {
this.edgea = edgea;
} else {
throw new EdgeTooSmallException("边长A不能小于或等于0");
}
}
// edgeb的get/set方法
public int getEdgeb() {
return edgeb;
}
public void setEdgeb(int edgeb) throws EdgeTooSmallException {
if (edgeb > 0) {
this.edgeb = edgeb;
} else {
throw new EdgeTooSmallException("边长B不能小于或等于0");
}
}
// edgec的get/set方法
public int getEdgec() {
return edgec;
}
public void setEdgec(int edgec) throws EdgeTooSmallException {
if (edgec > 0) {
this.edgec = edgec;
} else {
throw new EdgeTooSmallException("边长C不能小于或等于0");
}
}
// 判断是不是三角形
public static void Checking(int x, int y, int z) throws EdgeNotMatchException {
if (x + y <= z || x + z <= y || y + z <= x) {
throw new EdgeNotMatchException("这不是三角形");
} else {
System.out.println("这是个三角形");
}
}
}
class TriangleDemo {
public static void main(String[] args) {
// 构造三角形
Triangle t1 = new Triangle();
// 设定三条边,找出异常
try {
t1.setEdgea(4);
t1.setEdgeb(5);
t1.setEdgec(3);
t1.Checking(t1.getEdgea(), t1.getEdgeb(), t1.getEdgec());
} catch (EdgeTooSmallException e) {
System.out.println(e.getInfo());
System.exit(-1);
} catch (EdgeNotMatchException e) {
System.out.println(e.getInfo());
System.exit(-1);
}
System.out.println("边长为" + t1.getEdgea() + "," + t1.getEdgeb() + "," + t1.getEdgec());
}
}
3.Person类中增加birthday属性，对setBirthday(int ,int , int )方法进行异常处理，要求年有效、月有效、日有效、年月日指定的具体日期有效，对不同情况分别抛出不同的异常。
public class invalidParamException extends Exception {
public invalidParamException(String msg){
//super(msg);
System.out.println("你麻痹");
System.out.println(msg);
}
}
public class Birthday {
private String birthday;
public String getBirthday() {
return birthday;
}
public void setBirthday(int year, int month, int date) throws invalidParamException {
// 判断年份
if (year < 1900 || year > 2016) {
throw new invalidParamException("年份不合适，请输入1900年到2016年的年份");
}
if (month < 0 || month > 12) {
throw new invalidParamException("月份不合适，不存在" + month + "月");
}
if (date < 0 || date > 31) {
throw new invalidParamException("日期不合适，不存在" + date + "日");
}
boolean isThirdOne = date == 1 || date == 3 || date == 5 || date == 7 || date == 8 || date == 10 || date == 12;
if (!isThirdOne && date == 31) {
throw new invalidParamException("日期不合适，" + month + "月不存在" + date + "日");
}
if (month == 2 && date > 29) {
throw new invalidParamException("日期不合适，二月不存在" + date + "日");
}
if (year % 4 != 0 && month == 2 && date == 29) {
throw new invalidParamException("日期不合适，" + year + "不是闰年，所以2月不存在" + date + "日");
}
System.out.println("生日为：" + year + "年" + month + "月 " + date + "日 ");
}
public class birthdayDemo {
public static void main(String[] args) throws invalidParamException {
Birthday person = new Birthday();
try {
person.setBirthday(2015, 12, 5);
person.setBirthday(2016, 2, 29);
person.setBirthday(2015, 2, 29);
person.setBirthday(2015, 3, 5);
} catch (invalidParamException e) {
}
}
}