Java基础 day1

1.测试
public class Test1 {
public static void main(String[] args) {
int age=18;
System.out.println(age);
}
public class Test2 {
public static void main(String[] args) {
int age=18;
age=19;
System.out.println(age);

    age=age+1;
    System.out.println(age);
}

/**

• Test3类用于演示基本的数学运算和输出操作
  /
  public class Test3 {
  /*
  • 程序入口点，执行主要的业务逻辑
  • @param args 命令行参数数组
    */
    public static void main(String[] args) {
    int money=100;
    // 从money中减去10元
    money=money-10;
    System.out.println(money);
    }

public class Test4 {
public static void main(String[] args) {
int age=18;
System.out.println(age);
}
}

public class Test5 {
public static void main(String[] args) {
System.out.println(97);

    System.out.println(0b01100001);

    System.out.println(0141);

    System.out.println(0x61);
}

}
public class Test6 {
public static void main(String[] args) {
byte a=100;

    short s=1;

    int c=100;
    System.out.println(10);

    long l1=100;
    long l2=33333333l;

    float f1=1.1f;
    double d1=1.1;
    System.out.println(1.1);

    char c1='a';
    char c2='b';

    boolean b1= true;
    boolean b2=false;
}

}
public class Demo1 {
public static void main(String[] args) {
System.out.println(666);
System.out.println(-888);

    System.out.println(3.14);
    System.out.println(-3.14);

    System.out.println('a');
    System.out.println('我');
    System.out.println('不');
    System.out.println('爱');
    System.out.println('你');
    System.out.println("我不爱你");
    System.out.println("abcd");
    System.out.println(true);
    System.out.println(false);

    System.out.println("-----------------");

    //制表符\t
    System.out.println("你好");
    System.out.println("你\t好");

    //换行符\n
    System.out.println("你\n好");
}

}
2.作业
public class day01 {
public static void main(String[] args) {
//基础部分练习1
System.out.println("The harder you try, the luckier you get");
//基础部分练习2
System.out.println("手动敲\n治百病");
//字面量练习1
System.out.println(20);
System.out.println(5.2);
System.out.println('我');
System.out.println("今天的学习，是为了明天更好的自己");
System.out.println(true);
//字面量练习2
System.out.println(10);
System.out.println(5.333);
System.out.println("小明");
System.out.println(true);

    //变量练习1
    int a=10;
    a=30;
    System.out.println(a);
    //变量练习2
    int age =18;
    age =age+1;
    System.out.println(age);
    //变量练习3
    double price = 300;
    price =price+233.50;
    System.out.println(price);
    price = price-200;
    System.out.println(price);
}

}
3.树状图