slice

bilibili/aceid/slice/test1/test.go

@@ -0,0 +1,54 @@
+package main
+
+import "fmt"
+
+func main() {
+	slice1 := []int{1, 2, 3}
+
+	fmt.Printf("len = %d, slice = %v\n", len(slice1), slice1)
+
+	var slice2 []int
+	fmt.Printf("len = %d, slice = %v\n", len(slice2), slice2)
+
+	var slice3 []int
+	slice3 = make([]int, 3)
+	slice3[0] = 100
+	fmt.Printf("len = %d, slice = %v\n", len(slice3), slice3)
+
+	var slice4 []int = make([]int, 3)
+	fmt.Printf("len = %d, slice = %v\n", len(slice4), slice4)
+
+	slice5 := make([]int, 3)
+	fmt.Printf("len = %d, slice = %v\n", len(slice5), slice5)
+
+	var slice6 []int
+	if slice6 == nil {
+		fmt.Println("slice6为空")
+	} else {
+		fmt.Println("slice长度为", len(slice6))
+	}
+
+	// 长度与容量
+	var numbers = make([]int, 3, 5)
+	fmt.Printf("len = %d, cap = %d, slice = %v\n", len(numbers), cap(numbers), numbers)
+	// 追加一个元素1（len(numbers) = 4）
+	numbers = append(numbers, 1)
+	fmt.Printf("len = %d, cap = %d, slice = %v\n", len(numbers), cap(numbers), numbers)
+	numbers = append(numbers, 2)
+	fmt.Printf("len = %d, cap = %d, slice = %v\n", len(numbers), cap(numbers), numbers)
+	numbers = append(numbers, 3)
+	fmt.Printf("len = %d, cap = %d, slice = %v\n", len(numbers), cap(numbers), numbers)
+
+	var numbers2 = make([]int, 3)
+	fmt.Printf("len = %d, cap = %d, slice = %v\n", len(numbers2), cap(numbers2), numbers2)
+
+	// 截取
+	s := []int{1, 2, 3}
+	s1 := s[0:2]
+	s2 := make([]int, 3)
+	copy(s2, s)
+	s[1] = 200
+	fmt.Println(s1)
+	fmt.Println(s)
+	fmt.Println(s2)
+}