java×°ÏäÓë²ðÏä

/**
* ==ºÅÊDZȽÏÁ½¸ö»ù±¾ÀàÐÍÊÇ·ñÏàµÈ,»òÕ߱ȽÏÁ½¸ö¶ÔÏóÒýÓÃÊÇ·ñÏàͬ
*/
public class T {

public static void main(String[] args) {
Integer i1 = 128;
Integer i2 = 128;
int i3 = 128;
int i4 = 128;
Integer i5 = 127;
Integer i6 = 127;

Long long1 = 128L;
Long long2 = 128L;
long long3 = 128L;
long long4 = 128L;
long long5 = -128L;
long long6 = -128L;

//-128 ~ 127Ö®¼äÊýÖµ×°Ïäʱ»á¹²ÏíÄڴ渱±¾, ³¬¹ýÕâ¸ö·¶Î§£¬Ôò²»»á¹²ÏíÒýÓ㬼´¶ÔÏóµØÖ·½«²»Í¬

System.out.println(i1 == i2); //ʵÖÊÊDZȽÏÁ½¸ö²»Í¬ÒýÓà false
System.out.println(i5 == i6); //ʵÖÊÊDZȽÏÁ½¸öÏàͬ£¨¹²Ïí£©ÒýÓÃtrue
System.out.println(i1 == i3); //ÏȽ«i1²ðÏ䣬Ȼºó±È½Ï»ù±¾ÀàÐÍ true
System.out.println(i1.equals(i4)); //ÏȽ«i4×°Ï䣬Ȼºó±È½Ï»ù±¾ÀàÐÍ true

System.out.println(long1 == long2);//Á½¸öÒýÓò»Í¬ false
System.out.println(long5 == long6);//¹²Óø±±¾ true
System.out.println(long1 == long3);//long1ÏȲðÏ䣬 ÔÚ±È½Ï true
System.out.println(long2.equals(long4));//long4ÏÈ×°Ïä, ÔÙequals, true
}
}