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从控制台输入一个日期，求此日期20天后的日期值（时间类型为 LocalDateTIme ，做完后再使用 java.util.Date再做一次）
public class LocalDate { public static void main(String[] args) { LocalDateTime localDateTime = LocalDateTime.now(); LocalDateTime plusDaysResult = localDateTime.plusDays(20L); System.out.println("当前时间是 : " + localDateTime + "\n" + "当前时间加20天后为 : " + plusDaysResult + "\n"); } }
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银行要求金额精确小数点后两位。从屏幕任意输入两个小数，进行加减乘粗运算后结果要求保留2位小数（BigDecimal）
int main() { int x,y; printf("请输入第一个数:\n"); scanf("%d",&x); printf("请输入第二个数:\n"); scanf("%d",&y); prinf("相加:%d\n",x+y); prinf("相减:%d\n",x-y); prinf("相乘:%d\n",x*y); prinf("相除:%.2f\n",x/(y*1.0));//把y*1.0转换成float类型的 printf("取余:%d",x%y); }
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给定一个日期，求此日期所在月份的第一天是星期几
package lxx; import java.util.Scanner; /** * @author kangjiafu * @date 2021/5/5 20:40 */ public class main { public static void main(String[] args) { int totalDay = 0; int dayOfWeek; int day = 0; int dayOfYear = 0; Scanner cs = new Scanner(System.in); System.out.print("请输入年:"); int year = cs.nextInt(); System.out.print("请输入月:"); int month = cs.nextInt(); boolean bool = false; if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { bool = true; } for (int i = 1900; i < year; i++) { if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) { totalDay += 366; } else { totalDay += 365; } } for (int i = 1; i <= month; i++) { switch (i) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: day = 31; break; case 4: case 6: case 9: case 11: day = 30; break; case 2: if (bool) { day = 29; break; } else { day = 28; break; } } if (i < month) { dayOfYear += day; } totalDay += dayOfYear; dayOfWeek = (1 + totalDay) % 7; System.out.println("星期天\t星期一\t星期二\t星期三\t星期四\t星期五\t星期六"); for (int i1 = 0; i < dayOfWeek; i++) { System.out.print("\t"); } for (int i1 = 1; i <= day; i++) { if ((totalDay + i) % 7 == 6) { System.out.print(i + "\n"); } else { System.out.print(i + "\t"); } } } } }
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建立一个名叫Cat的类：
属性：姓名、毛色、年龄
方法：显示信息show【功能自定】、喊叫shout【功能自定】
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创建一个对象猫，姓名为“妮妮”，毛色为“灰色”，年龄为2岁，在屏幕上输出该对象的毛色和年龄，让该对象调用“显示信息”和“喊叫”两个方法。
public class Cat { String name; String color; int age; public void xingMing(){ System.out.println("妮妮"); } public void hanJiao(){ System.out.println("喵"); } }public class CatTest { public static void main(String[] args){ Cat c=new Cat(); c.name="妮妮"; c.color="灰色"; c.age=2; System.out.println("该猫的颜色为："+c.color); System.out.println("该猫的年龄为："+c.age+"岁"); c.xingMing(); c.hanJiao(); } }
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创建一个叫做机动车的类：
- 属性：车牌号(String)，车速(int)，载重量(double)
- 功能：加速(车速自增1)、减速(车速自减1)、修改车牌号（修改为任意值），查询车的载重量。
编写两个构造方法：一个没有参数，在方法中将车牌号设置“XX1234”，速 度设置为100，载重量设置为100；另一个构造方法带参数，能为对象的所有属性赋值
public class main { private String chepaihao; private int chesu; private double zaizhong; public String getChepaihao() { return chepaihao; } public void setChepaihao(String chepaihao) { this.chepaihao = chepaihao; } public int getChesu() { return chesu; } public void setChesu(int chesu) { this.chesu = chesu; } public double getZaizhong() { return zaizhong; } public void setZaizhong(double zaizhong) { this.zaizhong = zaizhong; } public main() { chepaihao="XX231"; chesu=100; zaizhong=100; } public main(String chepaihao, int chesu, double zaizhong) { super(); this.chepaihao = chepaihao; this.chesu = chesu; this.zaizhong = zaizhong; } public void jiasu(int sudu) { if(sudu<0) { System.out.println("无法加速"); } else { chesu+=sudu; } } public void jiansu(int sudu) { if(sudu<0) { System.out.println("无法减速"); } else { if((chesu-sudu)<0) { System.out.println("减速失败"); } else { chesu-=sudu; } } } }public class che { public static void main(String[] args) { main che1=new main(); che1.setChepaihao("豫k5651"); che1.jiasu(30); System.out.println("车牌号="+che1.getChepaihao()); System.out.println("当前车速="+che1.getChesu()); System.out.println("载重="+che1.getZaizhong()); main che2=new main("豫j0394",120,200); che2.jiansu(20); System.out.println("车牌号="+che2.getChepaihao()); System.out.println("当前车速="+che2.getChesu()); System.out.println("载重="+che2.getZaizhong()); } }
