数组常见操作

Posted 2020-10-03 心碎whn

数组的定义

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• int[] arr = new int[5];
• int[] arr = new int[]{1,2,3,4}
• int[] arr = {1,2,3,4}

 

取数组中的最值

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    public static void main(String[] args) {

        int[] va = {45,7,67,87,98,0,45,78,100};

        int tmp = va[0];

        for(int i=1;i<va.length;i++){
            if(tmp<va[i]){
                 tmp = va[i];
                 i++;
            }
        }

       System.out.println(tmp);  //最大值
    }

 

 

选择排序

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 public static void main(String[] args) {

        int[] va = {45,7,67,87,98,0,45,78,100};

        int tmp=va[0];

        for(int i=0;i<va.length-1;i++){
            for(int y=i+1;y<va.length;y++){
                if(va[i]>va[y]){
                    tmp = va[i];
                    va[i] = va[y];
                    va[y] = tmp;
                }
            }
        }

        for(int i:va){
            System.out.print(i);
            System.out.print("  ");
        }

    }

 

冒泡排序

---

 

        public static void main(String[] args) {

        int[] va = {45,7,67,87,98,0,45,78,100};


        int tmp=va[0];

        for(int i=0;i<va.length-1;i++){
            for(int y=0;y<va.length-1-i;y++){
                if(va[y] > va[y+1]){
                    tmp = va[y];
                    va[y] = va[y+1];
                    va[y+1] = tmp;
                }
            }
        }

        for(int i:va){
            System.out.print(i);
            System.out.print("  ");
        }
    }