Java SE学习总结 Day (2)
Day 02开篇:
"今天主要学习了Java程序开发的步骤,注释,关键字与保留字,标识符,常量,变量等。"
知识点反馈:
一.今天的知识点总结的思维导图
二.常量的注意事项
三. 多个变量操作的问题
四.强制类型转换(显示类型转换)
五.笔试题
例子:
package day01;
public class Text1 {
public static void main(String[] args) {
int j=80;//java成绩
int s=96;//sql成绩
int h=96;//html成绩
int chai=s-j;
int num=j+s+h;
int average=num/3;
System.out.println("sql和java的成绩之差为:"+chai);
System.out.println("三门成绩平均分为:"+average);
}
}
package day01;
public class Text2 {
public static void main(String[] args) {
double r=1.5;
double Π=3.14;
double area=Π*r*r;
double perimeter=2*Π*r;
System.out.println("圆的面积为:"+area);
System.out.println("圆的周长为:"+perimeter);
}
}
package day01;
public class Text3 {
public static void main(String[] args) {
int r = 8;
int bulk = r * r * r;
int area = r * r;
System.out.println("正方体的体积为:" + bulk);
System.out.println("正方体的表面积为:" + area);
}
}
package day01;
public class Text4 {
public static void main(String[] args) {
int r=6;
int h=8;
double Π=3.14;
double bulk=3/1*Π*r*r*h;
System.out.println("圆锥体的体积为:" + bulk);
}
}
package day01;
public class Text5 {
public static void main(String[] args) {
double length=6;//边长
double bottonLength=6;//底边的长
double high=6;//高
double perimeter=3*length;
double area=(bottonLength*high)/2;
System.out.println("三角形的周长:" + perimeter);
System.out.println("三角形的面积:" + area);
}
}
package day01;
public class Text5 {
public static void main(String[] args) {
double length=6;//边长
double bottonLength=6;//底边的长
double high=6;//高
double perimeter=3*length;
double area=(bottonLength*high)/2;
System.out.println("三角形的周长:" + perimeter);
System.out.println("三角形的面积:" + area);
}
}
package day01;
public class Text7 {
public static void main(String[] args) {
System.out.println((char)65);
}
}