java常用数据类型总结

基本数据类型

int

long

float

double

boolean

char

final double PI = 3.1415927;   声明常量

double[] myList = new double[size];   创建一个数组

遍历数组：

for(type element: array)
{
    System.out.println(element);
}

for (int i = 1; i < myList.length; i++)

{

System.out.println(myList[i]);

}

 ArrayList<ArrayList<Double>> data;  声明

Set<Cluster> clusterSet2;

ArrayList<float[]> Sim_In;

ArrayList<Double> sum = new ArrayList<Double>();

 List<Integer> jishu = new ArrayList<Integer>();

ArrayList<Double> sum2 = new ArrayList<Double>();

ArrayList<ArrayList<Double>> Sim_On=new ArrayList<ArrayList<Double>>();

ArrayList<float[]> Sim_All;

DistanceCompute disC2 = new DistanceCompute();

Vector 可实现自动增长的对象数组。 
java.util.vector提供了向量类(Vector)以实现类似动态数组的功能。 

   Vector<String> hs = new Vector<String>();
        hs.add("aa");
循环vector

 public void printSet(List hs) {
        Iterator iterator = hs.iterator();
        while (iterator.hasNext()) {
            System.out.println(iterator.next());
        }
    }