1.字串參照特性
String a1 = new String("1234");String a2 = 1234;
String a3 = 1234;
a1 == a2 -> false
a2 == a3 -> ture
但陣列不適用
2.foreach
package test;public class foreach {
public static void main(String[] args) {
int[][] $a= {{1,2,3,4},{5,6,7,8}};
int $key1=0, $key2=0;
for(int[] $i:$a){// 注意因為是二維所以第一維還是陣列要用[]
$key1++;
System.out.println($key1 + "{");
for(int $j:$i){
$key2++;
System.out.println($key2 + ":" + $j);
}
System.out.println("}");
System.out.println();
}
}
}
3.argv
import java.util.Arrays;
public class argv {
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(Arrays.toString(args));
}
}
dos 打
->javac argv.java
->java argv aa bb cc
