提供一個臨時變量
public class swapInt { public static void main(String[] agrs){ int m = 12; int n = 5; System.out.方法2缺點：當m和n較大時，有可能會出現精度損失
public class swapInt { public static void main(String[] agrs){ int m = 12; int n = 5; System.out.println("m:"+m+" n:"+n); m = m + n; //m=12+5 n = m - n; //n=17-5 m = m - n; //m=17-12 System.out.println("m:"+m+" n:"+n);}優點：沒有以上兩種方法的缺點
public class swapInt { public static void main(String[] agrs){ int m = 12; int n = 5; System.out.println("m:"+m+" n:"+n); m = m ^ n; n = m ^ n;//(m^n)^n == m,相當于m值給n m = m ^ n;//(m^n)^m == n,相當于n值給m System.out.println("m:"+m+" n:"+n);}如圖解釋： 
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