package reck;
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import java.util.Arrays;
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public class Demo05 {
public static void main(String[] args) {
int[] a ={1,33,4,5,66,23,56,78};
System.out.println(a);//[I@14ae5a5
//直接打印输出是输出了一个对象
System.out.println(Arrays.toString(a));
//Arrays.toString(a)打印输出数组
printArrays(a);//调用自己写的方法输出
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}
//自己也可以定义类似的功能
//任何方法都是人写的要理解其背后的原理
public static void printArrays(int[] a){
for (int i = 0; i < a.length; i++) {
if(i==0){
System.out.print("["+a[i]+", ");
}
else if (i==a.length-1){
System.out.print(a[i]+"]");
}else {
System.out.print(a[i]+", ");
}
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?
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}
}
}
package reck;
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import java.util.Arrays;
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public class Demo05 {
public static void main(String[] args) {
int[] a ={1,33,4,5,66,23,56,78};
Arrays.sort(a);//升序排序
System.out.println(Arrays.toString(a));//打印输出
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}
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}
package reck;
?
import java.util.Arrays;
?
public class Demo05 {
public static void main(String[] args) {
int[] a ={1,33,4,5,66,23,56,78};
//a:所要填充的数组 0:数组内全部要填充的值为0
Arrays.fill(a,0);
System.out.println(Arrays.toString(a));
int[] b={1,33,4,5,66,23,56,78};
//fromIndex从2到tolndex4(4不算)填充为0
Arrays.fill(b,2,4,0);
System.out.println(Arrays.toString(b));
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}
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}
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原文:https://www.cnblogs.com/continue-student/p/14511654.html