this调用本类的其他构造器

 Student类：

package Java_project_1;

public class Student {
    private String name;
    private String schoolName;

    public Student() {
    }
    public Student(String name){
        this(name,"gq");
    }

    public Student(String name, String schoolName) {
        this.name = name;
        this.schoolName = schoolName;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSchoolName() {
        return schoolName;
    }

    public void setSchoolName(String schoolName) {
        this.schoolName = schoolName;
    }
}

主类：

package Java_project_1;
public class Java_project_1 {
    public static void main(String[] args){
        Student s1=new Student("亚雷","sdau");
        System.out.println(s1.getName());
        System.out.println(s1.getSchoolName());

        Student s2=new Student("N大比");
        System.out.println(s2.getName());
        System.out.println(s2.getSchoolName());
    }
}