为什么integer.min_value不等于变量中存储的integer.min_value？

Question

...
private static final Integer MINF = Integer.MIN_VALUE;
Integer head,tail;
...

Interval i = new Interval(Integer.MIN_VALUE,10);
System.out.println(i.toString()); //[-2147483648,10]

public String toString() { 
    ...
    //What the hell?
    System.out.println("MINF == Integer.MIN_VALUE: " + (MINF == Integer.MIN_VALUE)); //true
    System.out.println("MINF == this.head: " + (MINF == this.head)); //false
    System.out.println("Integer.MIN_VALUE == this.head: " + (Integer.MIN_VALUE == this.head)); //true
    ...
    return "*insert interval in format*";
} 

Answer 1

Integer是包装类，是Object的子类，包含int值。

如果只使用基元类型int，==将进行数值比较，而不是对象地址比较。

请注意，integer.min_value当然也是int。