经典面试问题：两整数互换

public static void main(String[] args) {
// TODO Auto-generated method stub
ChangeInt1();
ChangeInt2();
ChangeInt3();
ChangeInt4();

}

public static void ChangeInt1()
{
int a=10;
int b=5;
int t=a;
a=b;
b=t;
System.out.println("test1 a:"+a);
System.out.println("test1 b:"+b);
}
public static void ChangeInt2()
{
int a=10;
int b=5;
a=a+b;
b=a-b;
a=a-b;
System.out.println("test2 a:"+a);
System.out.println("test2 b:"+b);
}
public static void ChangeInt3()
{
int a=10;
int b=5;
a=a^b;
b=a^b;
a=a^b;
System.out.println("test3 a:"+a);
System.out.println("test3 b:"+b);

}
public static void ChangeInt4()
{
int a=10;
int b=5;
a=b+0*(b=a);
System.out.println("test4 a:"+a);
System.out.println("test4 b:"+b);
}

Print:

test1 a:5
test1 b:10
test2 a:5
test2 b:10
test3 a:5
test3 b:10
test4 a:5
test4 b:10