int a = 'B';
System.out.println(a);
 int a = 'B';
System.out.println(a);

package variable;

public class HelloWorld {

    public static void main(String[] args) {
        int year = 1949;
        System.out.println(year);
    }
}

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package how2j.t3;
 
public class bianliang {
    public static void main(String[] args) {
        System.out.println("HelloWorld");
    }
     
}

package how2j.t3;

public class bianliang {
	public static void main(String[] args) {
		System.out.println("HelloWorld");
	}
	
}

/*
开发者：yby
日期：02/11/2022
 */
//定义一个Hero的类
public class Hero {
    String name;//英雄的姓名
    float hp =  100;//血量
    float armor=100;//护甲
    int moveSpeed;//移动速度
    int money;//金钱
    //这是一个无参的构造方法
    public Hero() {

    }
//有参的构造方法
    public Hero(String name, float hp, float armor, int moveSpeed) {
        this.name = name;
        this.hp = hp;
        this.armor = armor;
        this.moveSpeed = moveSpeed;
    }
/*
定义一个方法keng（）
作用：坑队友
 */
public void keng(){
    System.out.println("坑队友！");
}
    /*
    定义一个方法legendary（）
    作用：提示你已经超神
     */
    public void legendary(){
        System.out.println("你已经超神！");
    }
    /*
       定义一个方法getHp（）
       作用：获取英雄的血量
        */
    public float getHp()
    {
        return hp;
    }

    /*
    定义一个方法getArmor（）
    作用：获取英雄的护甲
     */
public float getArmor(){
    return armor;
}
    /*
          定义一个方法recovery（）
          作用：恢复英雄的血量
           */

    public float recovery(float blood){
        return  hp = hp +blood;
    }
    /*
      定义一个方法addSpeed（）
      作用：增加英雄的速度
       */
    public void addSpeed(int speed)
    {
        moveSpeed = moveSpeed+speed;
    }

    public static void main(String[] args) {
        //创建garen这个类
        Hero garen = new Hero();
        garen.name = "盖伦";
        garen.hp = 616;
        garen.armor = 27;
        garen.moveSpeed = 350;
        garen.addSpeed(100);
        System.out.println("英雄的名字="+garen.name);
        System.out.println("英雄的血量="+garen.hp);
        System.out.println("英雄的护甲="+garen.armor);
        System.out.println("英雄的移动速度="+garen.moveSpeed);
        //创建一个temo这个类
        Hero temo = new Hero();
        temo.name = "提莫";
        temo.hp = 616;
        temo.armor = 27;
        temo.moveSpeed = 350;
        System.out.println("英雄的名字="+temo.name);
        System.out.println("英雄的血量="+temo.hp);
        System.out.println("英雄的护甲="+temo.armor);
        System.out.println("英雄的移动速度="+temo.moveSpeed);
    }
}

String name = "kkt";

package xiangmu;

public class ltem {
		public static void main(String[] args){
			int year ;
			int month;
			int day ;
			String name;
			
			year = 1949;
			month = 10;
			day = 1 ;
			name = "中国";
			System.out.println(name + "诞生时间" + ":"+ year+ "." + month + "." + day + "." );
		}

		}

没有定义kkt变量

int year= 1944; 
String name ="盖伦"；
 System.out.println(name+year);

public class Demo1 {
	public static void main(String[] args) {	
		int age=10;
		char a='a';
		String name="abc";
	}
}

public class bl {
public static void main(String[] args) {
	int year = 1;
	System.out.println(year+"弘昼5");
}
}

public class XueXiJava {
    public static void main(String[] args) {
        //int year, month, day, name;
        int year, month, day;
        String name;

        year = 2001;
        month = 6;
        day = 21;
        //name = ktt;
        name = "ktt";
        System.out.println(year + "." + month + "." + day + "." + name);
    }
}

public class Test8 {
	public static void main(String[] args) {
		 int year, month, day;
		 String name;
	        year = 2001;
	        month = 6;
	        day = 21;
	        name = "ktt";
	        System.out.println(year + "."+ month+"."+day+"."+name);
	}
}

public class xuexiJAVA {
    public static void main(String[] args) {
        int year, month, day;
        String name;
        year = 2001;
        month = 6;
        day = 21;
        name = ktt;
        System.out.println(year + "."+ month+"."+day+"."+name);
    }
}

public static void main(String[] args) {
        int year, month, day;
        String name;
        year = 2001;
        month = 06;
        day = 07;
        name = "张三";
        System.out.println(year + "."+ month+"."+day+"."+name);
    }

public class xuexiJAVA {
    public static void main(String[] args) {
        int year, month, day, name;
        year = 2001;
        month = 6;
        day = 21;
        name ="ktt";
        System.out.println(year + "."+ month+"."+day+"."+name);
    }
}

public class xuexiJAVA {
    public static void main(String[] args) {
        int year, month, day;
        String name;
        year = 2001;
        month = 6;
        day = 21;
        name = 577;
        System.out.println(year + "."+ month+"."+day+"."+name);
    }
}