Java语言支持的变量类型

Java局部变量

public class Test{
public void pupAge(){
int age = 0;
age = age + 7;
System.out.println("age+7 = : " + age);
}
public static void main(String args[]){
Test test = new Test();
test.pupAge();
}

实例变量

import java.io.*;
public class Test{
// 这个实例变量对子类可见
public String key;
// 私有变量，仅在该类可见
private double value;
//在构造器中对key赋值
public Test (String empName){
key = empName;
}
//设定value的值
public void setSalary(double empSal){
value = empSal;
}
// 打印信息
public void printEmp(){
System.out.println("键 : " + key );
System.out.println("值 : " + value);
}
public static void main(String args[]){
Test empOne = new Test("RUNOOB");
empOne.setSalary(1000);
empOne.printEmp();
}
}

类变量（静态变量）

public class Test
{
//私有静态变量
private static double salary;
// 常量
public static final String DEPARTMENT = "私有静态变量";
public static void main(String args[])
{
salary = 10000;
System.out.println( DEPARTMENT + "值 = " + salary);
}
}