public class demo {
	public static void main(String[] args) {
		short a=1,b=2,c;
		c=1+2;
		c=1+40000;
		c=a+1;
		c=a+b;
	}
}

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
	Type mismatch: cannot convert from int to short

package com.How2j.NovembreSixteen;

public class ZhuanHuan {

	public static void main(String[] args) {
		short a = 1;
		short b = 2;
		int c=a+b;
		System.out.println(c);
		System.out.println("精度小于int的数值运算的时候都会被自动转换为int后进行计算");
		System.out.println("如果short a = 1;	short b = 2;short c = a+b;  那么必须强制转换类型c=(short)(a+b)");
		System.out.println("才能显示结果是short类型");

	}

}

public class Exercise1112 {
	public static void main(String[] args){
		short a = 1;
		short b = 2;
		int c = (a + b);
		System.out.println(c);
		
	}

}

public class Conversion {
  public static void main(String[] args){
	  short a = 1;
	  short b = 2;	
	  short c = (short) (a+b);
	  System.out.println(c);
	  }
}

package j2se;

public class Hero{
     
  public static void main(String[] args){
	  short a = 1;
	  short b = 2;
	  short c = (short) (a+b);
	  System.out.println(c);
      
  }
}

public class Demo {
    public static void main(String[] args) {
        short a = 1;
        short b =2;
        short c= (short)(a+b);   //不加强转会报错，Incompatible Types
        System.out.println(c);
    }
}

public class lesson3{
	public static void main(String[] args){
		byte b = 1;
		short s = 200;
		int i = 300;
		long l = 400;
		char c2 = '信';
		char c3 = '己';
		double d = 666.666;
		float f = 52.888f;
		boolean b1 = true;
		boolean b2 = false;
		String str = "Hello Dota";
		float ff = 3.14f;
		double dd = 2.7694343;
		int aa = 365;
		byte bb = 12;
		char cc = '吃';
		boolean bb1 = false;
		String ss = "不可描述"; 
		
		long val = 26L;
		int dec = 26;
		int hex = 0x1a; //16进制
		int ox = 032; //8进制
		int bin = 0b11001; //2进制
		System.out.println(bin);
		float f1 = 123.4f;
		double d1 = 123.4;
		double d2 = 1.235e2;
		String name = "ABC";
		char aaa = 'a';
		char ddd = '\n';
		byte bbbb = 2;
		short ssss =  35;
		int iii = 100000;
		long lfff = 555555L;
		float fff = 5552.5f;
		double ddddd = 5552451.652;
		char ccccc = 'c';
		String strrr = "aaaaaaa";
		
		char c1 = 'A';
		short s1 = 80;
		c1 = (char)s;
		//s1 = c2; 直接转换会出现错误
		long l11 = 50;
		int i1 = 50;
		l11 = i;
		
		byte b11 = 5;
		int i11 = 10;
		int i12 = 300;
		b = (byte)i11;
		System.out.println(b);
		b = (byte)i12;
		System.out.println(b);		
		System.out.println(Integer.toBinaryString(i12));
		
		short a111 = 1;
		short a222 =2;
		c222 = a111 + a222;
	}
}

public class HelloWorld2 {
	public static void main(String[] args) {
		short a=1;
		short b=2;
		System.out.println(a+b);
	}
}

package cs;

public class lianxi {
	public static void main(String[] args) {
		short a = 1;
		short b = 2;
		System.out.println(a + b);
	}
}

public class Demo1 {
	public static void main(String[] args) {
		short a =1;
		short b = 2;
		//short d = a + b; error
		int c = a + b;
		System.out.println(c);
	}
}

public class Conversion {

	public static void main(String[] args) {

		
		// 作业
		short a1 = 1;
		short b1 = 3;
		short c1 = (short) (a1 + b1); // 如果不加括号,就会将a强制转换,b不变
		short c2 = (short) (a1 - b1);
		System.out.println(a1 + "+" + b1 + "=" + c1);
		System.out.println(a1 + "-" + b1 + "=" + c2);
	}
}

public class 练习 {

	public static void main(String[] args) {
		short a = 1;
		short b = 2;
		byte c = (byte)(a+b);//为何要加括号，才能运行真确？？？
		System.out.println(c);
			
	}

}

public class TypeChange {
	public static void main(String[] args) {
		short a = 1;
		short b = 2;
		System.out.println("a+b将会是int类型，原因：此处属于隐式转换");
		System.out.println("隐式转换：小容器--大容器转换");
		System.out.println("显示转换：大容器--小容器转换\t需要在运算符后加上转换的类型且转换类型与运算符左边的变量类型一致");
	}
}

public class AIG {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		short a = 1;
		short b = 2;
		int C = a+b;
		byte d = (byte)(b-a);
		System.out.println(C);
		System.out.println(d);
	}

}

    public  void  homework(){
        short a=1;
        short b=3;
        int c=(short) (a+b);
        System.out.println("强制转换的值:"+c);
    }

public class HelloWorld{
	
	public static void main(String[] args){
		short a = 1;
		short b = 2;
		
		//两个short类型做加法，首先转成int类型
		int c = a + b;
		System.out.println(c);
	}
}

public class Test {
public static void main(String[] args) {
	float i=3.1415f;
	float j=2.5f;
	float k=i+j;
	System.out.println(k);
	System.out.println();
	short a=1;
	short b=2;
	short c=(short)(a+b);
	System.out.println(c);
  }
}

int 类型

public class Variable {
    public static void main(String[] args){
        byte a=1;    
        int b=2;
        a=b;//编译报错
}
}

public class HelloWorld {
    public static void main(String[] args) {
    	short a = 1;
    	short b = 2;
    	
    	//已知！判断C最终值时，我加上了22亿，结果数已经超过某个类型最大范围
    	//是不能执行的
    	//short c = (short)(a + b + 2200000000);
    	
    	//得知！判断 D最终值时，我加上了22亿，
        //结果是可执行的，刚好在某个类型最大范围内那就是说明
    	//刚好在21亿的最大范围的类型是int
    	
    	short d = (short)(a + b + 2100000000);
    	
    	System.out.println(d);
    	
    }
}
         //结论，a+b，数值运算出的类型，应该就是int了
         //这样判断，不知道，算不算赖皮，但我觉的是这样应该算是逻辑判断法吧。

package HelloWorld;

public class DemoOne {
	public static void main(String[] args) {
		short a = 1;
		short b = 2;
		short d = (short)(a + b);
		int c = a + b;
		long v = a + b;
		double g = a + b;	
		float n = a + b;
		System.out.println(d);
	}

}

public class Test {
    private static String getType(Object obj){
        return obj.getClass().toString();
    }
    public static void main(String[] args) {
        short a = 1;
        short b = 2;
        System.out.println(getType(a+b));
    }
}

package how2j03;

import javax.swing.plaf.synth.SynthRootPaneUI;

/** 
 * @ClassName: Variable04 
 * @Description:Java基础知识回顾整理--03变量--04数据类型转换
 * @author:    PeterChen
 * @date:      2019年4月24日 下午10:46:16 
 *  
 */
public class Variable04 {
	public static void main(String[] args) {
		char c = 'A';
		short s = 80;
		
		// char、short相互转换都可以的
		//c = (char)s;
		//s = (short)c;
		
		// 虽然short和char都是16位的，长度一样。但是彼此之间，依然需要进行强制类型转换
		c = (char)s;
		
		
		byte b = 5;
		int i1 = 10;
		int i2 = 300;
		b = (byte)i1;
		
		System.out.println(b);
		System.out.println(Integer.toBinaryString(b));
		
		b = (byte)i2;
		
		System.out.println(b);
		
		System.out.println(Integer.toBinaryString(i2));
		
		
		short x = 1;
		short y = 2;
		
		System.out.println(getVariableDataType((x+y)));
	}
	
	/** 
	 * @Title: getVariableDataType 
	 * @Description: 获取变量的数据类型的方法
	 * @param: @param object
	 * @param: @return    
	 * @return: String    
	 * @throws 
	 */
	public static String getVariableDataType(Object object){
		return object.getClass().toString();
	}
}

package Variable;

public class Var2 {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		   byte b = 5;
		   int i1=10;
		   int i2=300;
		   short s=127;
		   int i = 32;
		   long l = 12564;
		   float f = 1.3256f;
		   double d = 2.15;
		   char c = '你';
		   String str ="学好java";
		   short a=1;
		   short b1 = 2;
		   System.out.println(a+b1);
		    System.out.println(b);
		    System.out.println(s);
		    System.out.println(i);
		    System.out.println(l);
		    System.out.println(f);
		    System.out.println(d);
		    System.out.println(c);
		    System.out.println(str);
		    b=(byte)i1;
		    System.out.println(b);
		    b=(byte)i2;
		    System.out.println(b);
		    System.out.println(Integer.toBinaryString(i2));
		    
		  
	}

}

public class day02_1 {
	public static void main(String[] args) {
		short a = 1;
		short b = 2;
		short  c = (short)(a + b);
		System.out.println(c);
	}
}

public class VariableType {
	public static void main(String[] args) {
	
		short a = 1;
		short b = 2;
		short c = (short) (a+b);
		System.out.println(c);
		
		int d = 20;
		int e = 22;
		int f = (d+e);
		System.out.println(f);
		
		byte a1 = 7;
		byte a2 = 8;
		byte a3 = (byte) (a1+a2);
		System.out.println(a3);
		
		long b1 = 123456;
		long b2 = 654321;
		long b3 = (b1+b2);
		System.out.println(b3);
		
		byte q = 100;
		short w = 200;
		q = (short)100;
		short p = (short) (q + w);
		p = (short) (q+w);
		System.out.println(p);
 		
	}
}

public class TypeConversion {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		short a=1;
		short b=2;
		short c;
		c=(short) (a+b);
		System.out.println(c);
		
	}

}

public class variableTest {
    public static void main(String[] args) {
    	short a = 1;
    	short b = 1;
    	short c = a+b;
    
	}
}

public class Types_converting {
public static void main(String[] args){
	short a =1;
	short b =2;
	short c =(short)(a + b); //相加的结果，默认为INT类型
	System.out.println(c);
      }
}

public class Scan{
    public static void main(String[] args) {
        double number=0.618;
        double demo = 100;
        double a=0,b = 0,c=0;
        for(double i = 1; i<=20; i++)
            for (double j = 1; j <= 20; j++) {
                i=(double)i;
                j=(double)j;
                c = i / j;
                if (Math.abs(demo - number) > Math.abs(c - number)) {
                    a = i;
                    b = j;
                    demo = c;
                }

            }
        System.out.println("数值："+c+" 分子："+a+" 分母："+b);

    }
}

double 转换在idea里面报错

package test1;

public class variableTransfer2 {
	public static void main(String[] args) {
		short a = 1;
		short b = 2;
		//a+b的默认类型为int
		short c = (short) (a+b);
		int e =a+b;
		
	}
}

public class nameless {
	public static String getType(Object o) {
		return o.getClass().toString();
	}
	public static void main(String[] args) {
		byte a=1;
		byte b=2;
		byte c=(byte)(a+b);
		System.out.println(getType(c));
		System.out.println(getType(a+b));
		
	}
}

package cn.how2j;

public class TypeConversion {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		short a = 32767;
		short b = 32767;// short最大值
		System.out.println(a + b);// 没有运行错误，证明计算过程对类型进行了自动转换，默认int
	}

}

public class Variable {

	public static void main(String[] args) {
		short x=1;
		short y=2;
		int z;
		z= x + y;
		System.out.println(z);

	}

}

无

public class HelloJava{
    public static void main(String[] args){
      short s =1;
      short s1 =2;
      long l =6;
      l=(s+s1)*s1;
   }
}

public class Number3 {


    public static void main(String[] args){
       /* float a=3.14f;
        double b=2.769343;
        int c=365;
        int d=12;
        char e='吃';
        boolean f=false;
        String g="不可描述";
        System.out.println(a+"\n"+b+"\n"+c+"\n"+d+"\n"+e+"\n"+f+"\n"+g+"\n");*/

    /*   byte b=127;
       short s=20000;
       int i=128;
       long l=1234;
       float f=1234555.2566f;
       double d=12312312d;
       char c='1';
       String str="dsadasdas";
        System.out.println(b+"\n"+s+"\n"+i+"\n"+l+"\n"+f+"\n"+d+"\n"+c+"\n"+str);*/
        short a=1;
        short b=2;
        int c=a+b;
        System.out.println(a+b);


    }
}

public class Hello {
//	double d;
//	float f;
//	short s;
//	byte b;
//	char c;
//	boolean bln;
//	String str;
public static void main(String[] args){
//	Hello hello= new Hello();
//	hello.d=3.14;
//	hello.f=2.769343f;
//	hello.s=365;
//	hello.b=12;
//	hello.c='吃';
//	hello.bln=false;
//	hello.str="不可描述";
//	System.out.println("d:"+hello.d);
	short a=1;
	short b=2;
	short sum=(short)(a+b);
	int sum1=(int)(a+b);
	byte sum2=(byte)(a+b);
	long sum3=(long)(a+b);

	System.out.println(sum);
	System.out.println(sum1);
	System.out.println(sum2);
	System.out.println(sum3);
	
	
}
}

public class HelloWorld{
 public static void main(String[] args){
  System.out.println("hello world");
  
  byte b = 5;
  int i1 = 400;
  
  b = (byte) i1;
  
  
  
  System.out.println(b);
  
  //  我将i1的值设置为400  通过二进制转换取后8位 是110010000 可是得到的b的值为什么是-112 
     为什么不是144  这是哪出了问题呀  
  System.out.println(Integer.toBinaryString(i1));   
 }
} 

public class Five {
    public static void main(String[] args) {
    	short a =1;
    	short b = 2;
    	short c= (short)(a+b);
    	int d= a+b;
    System.out.println(c);
    System.out.println(d);
    }
}

public class test {
     public static void main(String[]args){
      
      short s1 = 1;
      short s2 = 2;
      short s = (short)s1+s2;
      
      System.out.println(s);
    }
}

Type mismatch: cannot convert from int to short

short a = 1;            
short b = 2;
int s=a=b;
//或者
short a = 1;
short b = 2;
s=(short)(a+b);

public class TestChange {
public static void main(String[] args) {
	short a = 1;
	short b = 2;
	//short c=a+b; 提示错误，不能从int转换为short ，a+b最后是int类型
	
}

}

public class HelloWorld{
	public static void main (String[]args) {
		short a=1;
		short b=2;
		int c=a+b;//！！！！注意byte和short类型编译时会转换成int
	}
}