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public void testCsdnJava();{
Integer b1 = -128;
Integer b2 = -128;
System.out.println( b1==b2);;
Integer c1 = -129;
Integer c2 = -129;
System.out.println( c1==c2);;
Integer j1 = 127;
Integer j2 = 127;
System.out.println( j1==j2);;
Integer k1 = 128;
Integer k2 = 128;
System.out.println( k1==k2);;
}
result:
true
false
ture
false