Java中“ this”的含义是什么？

Z时代
2024-01-10
分类：问答

Java中“ this”的含义是什么？

回答：

this 指当前对象

每个非静态方法都在对象的上下文中运行。因此，如果你有这样的课程：

public class MyThisTest {
  private int a;
  public MyThisTest() {
    this(42); // calls the other constructor
  }
  public MyThisTest(int a) {
    this.a = a; // assigns the value of the parameter a to the field of the same name
  }
  public void frobnicate() {
    int a = 1;
    System.out.println(a); // refers to the local variable a
    System.out.println(this.a); // refers to the field a
    System.out.println(this); // refers to this entire object
  }
  public String toString() {
    return "MyThisTest a=" + a; // refers to the field a
  }
}