a==b,b==c都为true，那a==c一定为true吗？？？

问题一：

int a = 50;
Integer a1 = 50;
Integer b1 = 50;
Integer c1 = 100;
Integer d1 = a1 + b1;

System.out.println(a == a1);
System.out.println(a == b1);
System.out.println(a1 == b1);
System.out.println(c1 == (a1 + b1));
System.out.println(c1 == d1);

        

          
        
        
        

          

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问题二：

int a = 100;
Integer a1 = 100;
Integer b1 = 100;
Integer c1 = 200;
Integer d1 = a1 + b1;

System.out.println(a == a1);
System.out.println(a == b1);
System.out.println(a1 == b1);
System.out.println(c1 == (a1 + b1));
System.out.println(c1 == d1);

        

          
        
        
        

          

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问题三：

int a = 200;
Integer a1 = 200;
Integer b1 = 200;
Integer c1 = 400;
Integer d1 = a1 + b1;

System.out.println(a == a1);
System.out.println(a == b1);
System.out.println(a1 == b1);
System.out.println(c1 == (a1 + b1));
System.out.println(c1 == d1);

        

          
        
        
        

          

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问题四：

double a = 50d;
Double a1 = 50d;
Double b1 = 50d;
Double c1 = 100d;
Double d1 = a1 + b1;

System.out.println(a == a1);
System.out.println(a == b1);
System.out.println(a1 == b1);
System.out.println(c1 == (a1 + b1));
System.out.println(c1 == d1);

        

          
        
        
        

          

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问题五：

double a = 200d;
Double a1 = 200d;
Double b1 = 200d;
Double c1 = 400d;
Double d1 = a1 + b1;

System.out.println(a == a1);
System.out.println(a == b1);
System.out.println(a1 == b1);
System.out.println(c1 == (a1 + b1));
System.out.println(c1 == d1);

        

          
        
        
        

          

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问题六：

double a = 0.1d;
double b = 0.2d;
double c = 0.3d;

System.out.println(c == (a + b));
System.out.println(0.3d == (a + b));

        

          
        
        
        

          

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问题七：

float a = 0.1f;
float b = 0.2f;
float c = 0.3f;

System.out.println(c == (a + b));
System.out.println(0.3f == (a + b));

        

          
        
        
        

          

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问题八：

int a = 0;
int b = 0;

System.out.println(a/b);

        

          
        
        
        

          

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问题九：

double a = 0d;
double b = 0d;

System.out.println(a/b);

        

          
        
        
        

          

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这里面有太多的我们初始学习时就遇到过的，有的遇到过的不止一遍，面试问到的也不止一遍，为什么到现在，我们还有些题目模棱两可呢，为什么不抽点时间好好看看这方面的知识呢？

答案一

true
true
true
true
true

        

          
        
        
        

          

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答案二

true
true
true
true
false

        

          
        
        
        

          

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答案三

true
true
false
true
false

        

          
        
        
        

          

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答案四

true
true
false
true
false

        

          
        
        
        

          

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答案五

true
true
false
true
false

        

          
        
        
        

          

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答案六

false
false

        

          
        
        
        

          

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答案七

true
true

        

          
        
        
        

          

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答案八

java.lang.ArithmeticException: / by zero

        

          
        
        
        

          

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答案九

NaN

        

          
        
        
        

          

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